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3 years ago

What substance makes up 75 to 90% of every cell in the human body?

Biology

2 answers:

elixir [45]3 years ago

7 0

I believe that substance would be water.

Helga [31]3 years ago

3 0

Answer:

Water.

Explanation:

The body of the living organism constitutes the element like hydrogen, oxygen, Nitrogen and Carbon. These elements are important for the proper functioning of the body.

The substance that makes the 75 to 90% of every cell is water. Water is made of hydrogen and oxygen element. The water dissolves most of the solutes of the body and maintains the cell permeability. The water maintains the integrity and structure of the cell as well.

Thus, the answer is water.

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Describe the process of skeletal muscle contraction by assembling the following 10 events in the proper order in paragraph form.

balu736 [363]

5) muscle fiber is stimulated at the neuromuscular junction triggering an action potential

7) APs travel down the T-tubules to the sarcoplasmic reticulum

Released acetylcholine (due to action potential within motor neuron) from the motor neuron initiates depolarisation within the sarcolemma, which is spread through the muscle fibre via T tubules.

8) in response to an AP, calcium ions are released into the cytosol/space around the myofibrils

Depolarisation causes the sarcoplasmic reticulum to release calcium ions necessary for the contraction

3) calcium ions bind to the T and T system

1) T and T system undergoes a conformational change, exposing the myosin binding sites on actin

6) myosin head/cross-bridges bind to actin

The binding sites for the myosin heads located on actin, are covered by a blocking complex (troponin and tropomyosin) that can be unblocked by the calcium binding

2) myosin heads/cross bridges bind to actin and flex, shortening the sacromere

4) actin filaments are pulled toward the center of the sacromere, shortening the muscle fiber

As the individual sarcomeres become shorten the muscle fibres as a whole contracts

10) myosin head continues to attach, flex, release, extend, and reattach as long as calcium ions are present

9) calcium ions actively transported into the sarcoplasmic reticulum

Relaxation of a muscle fiber occurs when a Ca ions are pumped back into the sarcoplasmic reticulum .

3 0

2 years ago

The Earth's surface can change either quickly or slowly. Which of these can happen when rocks and soil in the Earth move suddenl

alexandr402 [8]

Answer:

landslides

Explanation:

4 0

2 years ago

Read 2 more answers

I would like assistance

AnnZ [28]

I’m pretty sure the answer is c

8 0

3 years ago

A researcher proposes a model of an enzyme-catalyzed reaction in which a reactant is converted to a product. The model is based

lions [1.4K]

Answer: The answer is B: The enzyme's active site binds to and stabilizes the transition state, which decreases the activation energy of the reaction.

Explanation: An enzyme is a biological molecule which speeds up the rate of chemical reactions in the body (reactions within cells). They are proteins.

The transition state is the transition from substrate to product. The molecule is no longer a substrate but also not yet a product.

The enzyme is able to speed up the reaction by stabilizing the transition state. The transition state's energy is also the activation energy in terms of reaction. The activation energy is the minimum energy that is required to break some bonds of the reactants in order to turn them to products.

4 0

3 years ago

Help me do this graph please!!<br><br> Due: Thursday 12th March<br> 50 Points

Alecsey [184]

Removes carbon from air: photosynthesis by plants and algae
Release of carbon into atmosphere: respiration (animals exhale CO2), factory emissions, eruption of volcanoes, hydrothermal vents, and breakdown of organic matter
Release of carbon into the soil: Shells of marine organisms form limestone, and some carbon from decomposing organisms is stored in the soil
*This isn’t every possible pathway but hopefully this will help get you started. I’m going to attach a picture of the carbon cycle (not mine) to help you visualize the process.

4 0

3 years ago