Amyotrophic lateral sclerosis (ALS) is the most common motor neuron disease affecting adults (~30,000 in U.S.). It is a progressive, debilitating neuromuscular disorder that generally strikes in mid- to late-life (40-70 years) and can rapidly progress to death (3-5 years from onset). ALS is characterized by selective loss of motor neurons in spinal cord, which causes loss of skeletal muscle and weakness. Motor neurons in the largest motor units appear to be most vulnerable. Based on this, which type of motor neurons and muscle fibers would you expect to be most susceptible
Answer
Upper and Lower motor neurons, and Voluntary muscles.
Explanation:
Structurally,the motor neurons in the Brain are called the upper motor neurons.While the motor neurons in the spinal cord and the brain Nuclei are called the lower motor motor neurons.
Therefore, transmission of sensory impulses from the brain through the upper motor neuron are sent to the spinal cord through the lower motor neurons. These are eventually sent to the muscles(voluntary muscles) the effectors to bring response.
However, in ALS both the upper and lower motor neurons degenerate and die.Therefore transmission of action potential is impeded.Thus the voluntary muscles are made redundant with no sensory information and therefore they twitch (this is called fasciculations) and progressively undergo waste away.
As this progress the ability of the brain to initiate action potential for sensory information and its propagation is lost.
Therefore weakness of muscles and stiffness results,followed by complete loss of sensory transmission and inability of the individual to respond to sensory stimulus of walking, standing, eating, and breathing.Slurred and nasal speech,and muscles cramps are other symptoms
At advanced stage loss of life usually results from the respiratory failure.
it occurs mostly in the Caucasians and non-Hispanics between the age of 55-75,and common in males than females.It causes are blend of genetic and environmental factors.
Medication,therapy-physical and speech therapy are some means of treatments.
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Which of the following is an example of climate?
A. The polar regions have long winters and short, cool summers.
B. Humidity levels are high today.
C. Canada experienced an unusually warm summer this year.
D. Tornados formed across Oklahoma yesterday.
Answer:
A
Explanation:
The polar regions have long winters and short, cool summers BC of climate change and extra warmth. :))
Answer:
A
Explanation:
Its talking about what they had overall in that region
Earth's crust moves due
eruptions of magma.
convection currents in the mantle.
the inner core acting like a magnet.
the spinning of Earth.
Animals help ⚠️BLANK⚠️ flowers when eating it and depositing the seeds in a different area?
FILL IN THE BLANK PLEASE
Answer:
pollinate
Explanation:
Animals help ⚠️ pollinate flowers when eating it and depositing the seeds in a different area?
The image shows a rain forest ecosystem. The energy from plants,or producers ,acts qs rhe starting point of energy in the ecosystem. This energy is transferred to other organisms in the food web . In which two ways is the total amount of eneegy comversed in the ecosystem
Answer:
energy from plants and producers
Explanation:
energy from the sunlight to the plants which causes plants to go through photosynthesis how to eat food for consumers which creates energy
Help me with this question pleasee!!!!
Compare and contrast between seed plants and seedless plants:
Dominant generation:
Long distance of dispersal:
Answer:
seedless plants do not bear seeds for propagation, whereas seed plants bear seeds for multiplication.
Explanation:
The difference between seed plants and seedless plants is that seedless plants do not bear seeds for propagation, whereas seed plants bear seeds for multiplication. The plant kingdom is traditionally divided into four main divisions, i.e Thallophyta, Bryophyta, Pteridophyta and Spermatophyta
The sporophyte is the dominant generation, but multicellular male and female gametophytes are produced within the flowers of the sporophyte.
In many plants, the sporophyte generation is the dominant generation. This means that the sporophyte is larger and lives longer than the gametophyte generation.
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2. What is an example of something studied on the molecular level (as opposed to the atomic level)?
hydrogen
oxygen
water
protons
Answer:
Something studied on the molecular level is the water.
Explanation:
Water is a molecule formed by two hydrogen atoms and one oxygen atom, whose chemical representation is H₂O. It is a molecule whose polarity makes it a universal solvent of other polar molecules.
The molecular level corresponds to the level of organization where two or more atoms unite to form molecules or substances, united by chemical bonds. H₂O is studied at this level due to its chemical structure.
With respect to other options:
Hydrogen and oxygen are atoms, and correspond to the level of atomic organization.Protons are particles that are part of an atom, and correspond to the subatomic level.What makes your blood flow?
Answer:
The antioxidants, nitrates, vitamins and other substances contained in the foods above can have a positive impact on your circulation. What's more, leading a healthy lifestyle by abstaining from smoking, staying active, maintaining a healthy weight and eating a well-rounded diet can boost blood flow and overall health.
Explanation:
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Renewable resources are those resources which are inexhaustible in nature . It means these resourses are present in unlimited quantity and are environment friendly.
Geothermal energy is one of the example of renewable resources.
In geothermal energy, The word ' geo' stands for earth. So ,It basically means the energy that is extracted from the earth.
Here are some uses for the utilisation of renewable geothermal energy.
Geothermal energy helps in generating electricity.The geothermal power plant extract the heat from geothermal reservoirs. Then, This extracted heat is transfer to the heat engine .Which are responsible for running the heat engine smoothly and generation of electricity.
Geothermal energy helps in heating greenhouse .The heat that is released from the underground reservoirs are used to reduce green house gases because Geothermal energy needs very less CO2 . This heat is transfer in green house and it results into direct heating of green houses.
It also act as a tourist spotThere are so many people who wish to enjoy their leisure time peacefully. In winters, People like to visit the areas where hot spots are found .Which is a example of geothermal energy.
Geothermal energy helps in heating and cooling buildingsThe warm water is taken from underground reservoirs and then converted into hear energy. Then this heat energy is transfer in the building by using geothemal pumps helps in generating heat in building in winter. This same process is also follows for cooling of building.
It is also used as industrial purposeGeothermal energy is also used in industries for cooking, pastuerizing milk etc.
What do we call a genetic cross that follows two separate characters, such as pea seed color and pea seed shape?
Answer:
Dihybrid cross
Explanation:
Whereas a monohybrid cross is a cross between two organisms that differ in a single trait, a dihybrid cross follows two traits.
It describes a mating experiment in which the phenotypes of two genes are followed through to the offspring in order to study the inheritance at those genes
The part of the cell that act like your skin is the
A.membrane
B.protoplasm
C.nucleus
D.nerve
PLEASE HELP MEEE
Answer:
A
Explanation: The membrane acts like a shield for the cell to keep it safe. A plant cell has a cell membrane AND a cell wall but an animal cell ONLY has a cell membrane. It also filters what can go in and out of the cell. Hope this helps(:
Can someone please help <3
Answer:
Explanation:
find the letter and go in the path the wheel helps you
Can convection take place in the water if it is heated at the top?
Answer: If the heating is done on one small area on the top, there will be convection. If the heating is restricted to a small fraction of the heating area, then within that area the heating will go deeper than anywhere else on the surface. Then the unheated area will have a shallower region of high temperature. Then some convection will occur in the deeper layers, causing some motion on top.
This happens quite a bit during welding. Convection is very significant in welding, even when the heating is from the top.
Explanation: Hope this helps. I did copy it from another website so if ur going to use it make sure to reword it:)
Venoms and toxins are ____________ while others are components of ____________ or bacterial cell walls.
Answer:
free molecules; plasma membrane
Explanation:
-Venom are complex mixtures of molecules called "toxins"
-Plasma membrane is the membrane found in cells that separates the interior of the cell from the outside environment
How do the different types of receptors help you sense your environment?
Answer:
gg
Explanation:
Answer:
by developing a nerve impulse.
Explanation:
It detects changes in the internal or external environment by developing a nerve impulse. The different types of sensory receptors that respond to a specific type of stimuli are: Mechanoreceptors: The mechanoreceptors respond to forces and movements.
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Which class of mhc proteins presents exogenous antigens?.
Answer:
Class I
Explanation:
MHC Class II molecules presents endogenous
Which of the following is a natural resource for humans?
O Cars
O Electricity
O Houses
O Wood
Answer:
wood
Explanation:
PLEASE HELP WITH THIS
Answer:
Its C) DNA produces messenger RNA, also called mRNA.
Could I have brainliest..
Explanation:
Answer:
Its c)
Explanation:
DNA produces messenger RNA.
How is carbon dioxide produced in a cement plant
Carbon dioxide is produced in a cement plant when limestone is decomposed.
Cement is produced using lime stone as raw material. The limestone is decomposed according to the reaction;
CaCO3(s) -----> CaO(s) + CO2(g)
The CaO is used to produce cement while CO2 is a waste gas that escapes.
Hence, carbon dioxide is produced in a cement plant limestone is decomposed.
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which one protein makes ?
a) Ribosomes
b) mitochondria
c) nucleus
d) chloroplasts
Answer:
a. ribosomes
Explanation:
Which evolutionary adaptations helped plants succeed and spread on land?
vascular tissue and seeds
spores and pine cones
small size and small seeds
cotyledons and nonvascular tissue
Answer:
A
Explanation:
The evolutionary adaptations that helped plants succeed and spread on land are vascular tissue and seeds.
What is evolutionary adaptation of plants?This is the ability of plants to survive and thrive on land.
Plant adaptations to life on land is enhanced by the development of many structures such as;
A water-repellent cuticleStomata to regulate water evaporationSpecialized cells to provide rigid support against gravity, Specialized structures like chlorophyll to collect sunlightThus, the evolutionary adaptations that helped plants succeed and spread on land are vascular tissue and seeds.
Learn more about evolutionary adaptation of plants here: https://brainly.com/question/467368
why is my but red i need to know
Answer:
did you poop to hard did someone smack it there's many questions XD
ent is true or false.
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1 Mechanical energy is the sum of an objects kinetic and
potential energy
2 The kinetic theory of matter states that all of the particles
that make up matter are in a fixed position.
3 Heat is the energy transferred from an object at a higher
temperature to an object at a lower temperature.
a
Answer:
1.true2.true3.true
Explanation:
sorry not sure about this answer
Help me
Earth and space
Answer:
Most natural resources, including fossil fuels, are not distributed evenly around the Earth
So,your answer is unevenly distributed
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8.
What do you call the things in an experiment that must be the same to make it
fair?
A. Controlled variables
B. Dependent variables
C. Independent variables
D. Uncontrolled variables
Answer:
controlled variables
Explanation:
Controlled variables are ones that could affect the experiment, and the scientist keeps them the same to make it fair.
what are two chemicals used in testing for protein other
Answer:
Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple. Sugar with Benedict's solution. Protein with Biuret solution.Aug 10, 2020
Answer:
Biuret solution
Explanation:
Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple. Sugar with Benedict's solution. Protein with Biuret solution
Which label belongs in the area marked X?
nucleus
DNA
cell wall
ribosomes
Explain the mechanism maintaining osmotic gradient in renal medullary intestitium
In the inner medulla, urea recirculates, creating a greater osmotic gradient. It follows the concentration gradient formed by ADH-sensitive water reabsorption into the interstitial space from the collecting duct. The remaining water is drawn from the descending structures by increased interstitial osmolarity.
To maintain the vertical osmotic gradient, the blood supply to the renal medulla serves as a countercurrent exchanger. - The medullary vertical osmotic gradient is maintained by the vasa recta.
It enhances both water and urea permeability in the inner medullary collecting ducts, allowing urea to diffuse passively down its concentration gradient into the interstitial fluid. This contributes to the osmotic gradient and aids water absorption.
Which factor is most important in determining the erosive power of a stream?
Answer:
stream-water velocity
Explanation:
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Why is the third line of defense consider specific and adaptive
Answer:
The third line of defense is specific resistance. This system relies on antigens, which are specific substances found in foreign microbes. Most antigens are proteins that serve as the stimulus to produce an immune response. ... The activation of T-cells by a specific antigen is called cell-mediated immunity.
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Explanation: