The answer is The law of ''gravity'' helps explain why the density of air as the altitude above earth's surface increases.
(1) The varying number of muscle fibers that contract
<span>In most muscles, the number of muscle fibers in different motor units ranges from a few to hundreds. The nervous system can thus regulate the strength of contraction in a muscle by determining how many motor units are activated at a given instant and by selecting large or small motor unties to activate. </span>
some muscles are almost always partially contracted. In such muscles, the nervous system my alternate activation among the motor units, reducing the length of time any one set of fibers is contracted. Prolonged contraction can result in muscle fatigue due to the depletion of ATP and dissipation of ion gradients required for normal electrical signals.ing.
<span>(2) varying the rate at which muscle fibers are stimulated </span>
<span>single action potential produces a twitch lasting about 100 msec or less. If a second action potential arrives before the muscle fiber has completely relaxed, the two twitches add together, resulting in greater tension. Further summation occurs as the rate of stimulation increases. When the rate is so high that the muscle fiber cannot relax at all between stimuli, the twitches fuse into one smooth, sustained contraction called tetanus.</span>
An enzyme is a catalysts in living things.
A catalysts speeds up the process of breaking down molecules.
An example would be Lactose. It can be broken down by the enzyme Lactase.
The categorization of the characteristics based on whether they are describing chloroplasts or mitochondria are as follows:
- <u>Mitochondria:</u> carry out cellular respiration.
- <u>Chloroplasts:</u> carry out photosynthesis.
- <u>Mitochondria:</u> found in plant and animal cells.
- <u>Chloroplasts:</u> produce carbohydrates used as source of food for most living things.
- <u>Mitochondria:</u> abundant in human muscle cells.
- <u>Chloroplasts:</u> not found in animal cells.
- <u>Chloroplasts:</u> contain chlorophyll.
<h3>What is a cell?</h3>
A cell can be defined as the fundamental functional, structural and smallest unit of life, which is found within the body of an organism.
Some examples of cell organelles that are found in the body of an organism include the following:
- Mitochondria.
- Nucleus.
- Endoplasmic reticulum (ER).
- Vesicles.
- Cytoplasm.
- Cell membrane.
- Chromosome.
- Golgi apparatus (bodies).
- Chloroplast
<h3>What is
mitochondria?</h3>
Mitochondria can be defined as one of the cell organelles that is found in the body of a living organism.
Also, mitochondria is known as the powerhouse because it is saddled with responsibility of providing all the energy required in the cell, especially by transforming energy forms through series of chemical reactions.
Read more on mitochondria here: brainly.com/question/14861274
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<u>Complete Question:</u>
Categorize the following characteristics based on whether they are describing chloroplasts or mitochondria.
Chloroplasts Mitochondria
Carry out cellular respiration
Carry out photosynthesis
Found in plant and animal cells
Produce carbohydrates used as source of food for most living things
Abundant in human muscle cells
Not found in animal cells
Contain chlorophyll
