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irinina [24]
3 years ago
8

During the first step of cellular respiration, glucose is converted into

Biology
1 answer:
rewona [7]3 years ago
6 0
<span>A more efficient and widespread catabolic process, in which oxygen is consumed as a reactant to complete the breakdown of a variety of organic molecules. Similar in broad principle to the combustion of gasoline in an automobile engine after oxygen is mixed with hydrocarbon fuel. Food is the fuel for respiration. The exhaust is carbon dioxide and water. Includes both aerobic and anaerobic processes. However, it originated as a synonym for aerobic respiration because of the relationship of that process to organismal respiration, in which an animal breathes in oxygen.</span>
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When growing, as a cell gets bigger, what happens to its surface area to volume ratio?
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<u>Answer</u>:

Surface area to volume ratio decreases.

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When the cell enlarges beyond its capacity, it fails to supply enough material that can cross the membrane sooner so as to occupy the cellular volume. Hence the diffusion rate also decreases so as the ratio. The cell carry out its various functions to sustain through diffusion when diffusion rate is low it will ultimately affect the ratio. Bigger size affects the diffusion of the material to the out of the cell. as we know the diffusion occurs across the surface of the cell.

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In your own words, explain the role of the digestive, endocrine, and excretory systems in maintaining homeostasis. will mark bra
Katen [24]

Answer:

Following are the roles of the digestive, excretory and endocrine systems in terms of homeostasis:

  1. The endocrine system regulates the secretion of various hormones and homeostatic mechanisms in response to signals of the hypothalamus and pituitary glands.
  2. The excretory system maintains homeostasis by purifying the blood and getting rid of toxic waste from the blood.
  3. The digestive system is mainly involved in the transfer and regulation of nutrients from food.

Explanation:

Role of Endocrine System:

  • The endocrine system mediates all the chemical signaling in the body.
  • Hormones are chemical messengers that the endocrine system uses to maintain chemical homeostasis.
  • Endocrine system manages glucoregulation by controlling the secretion of the hormones glucagon and insulin by the pancreas. Low and high blood sugar levels are sensed by the brain which then signals the endocrine system to release glucagon and insulin respectively.
  • The endocrine system is also indirectly involved in thermoregulation. A low core temperature signal received by the hypothalamus initiates the release of TSH by the pituitary gland and then that of T3, T4 thyroid hormones that stimulate shivering thermogenesis in the skeletal muscles.

Role of Digestive System:

  • The digestive system regulates the amount of nutrients absorbed in the body.
  • Although the absorption of nutrients in food is not exactly according to bodily needs, the absorption of dietary iron and calcium is strictly regulated by the digestive system.

Role of Excretory System:

  • The excretory system carries out osmoregulation which is the maintenance and regulation of water and salt levels in the blood.
  • The excretory system regulates the excretion of toxic waste from the blood.
  • Excess water, salts, urea and bilirubin (produced as a result of RBC break down) are some of the excretions.
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