Chapter 1.5

Question 1

Metabolism

Answer 1

This refers to the collection of chemical reaction in cells that support life

Question 2

Water

Answer 2

is the most abundant substance in the body. REquired for a variety of metabolic proceses

Question 3

Food

Answer 3

refers to substances that provide organisms with necessary chemicals.

Question 4

Oxygen

Answer 4

makes up 1/5 of air. Used to release energy from nutrients.

Question 5

HEat

Answer 5

form of energy present in environment. Amount present partly controls rate at which reactions occur.

Question 6

Homeostasis

Answer 6

Refers to the body’s ability to keep its internal conditions stable, such that its cell can survive. To this end, all cells, whether as part of a tissue, an organ, or an organ system, make some specific contribution

Question 7

HHomeostatic Mechanics share what three components?

Answer 7

Receptors, Control Center, and Effectors

Question 8

Receptors

Answer 8

Are on the lookot. They provide information about specific conditions in the internal environment. A receptor may be as small as a cell or even a protein that is part of a cell

Question 9

Control Center

Answer 9

or decision maker, includes a set point that they try to maintain

Question 10

Effectors

Answer 10

Such as muscles or glands, tae action. They cause appropriate responses

Question 11

Negative Feedback

Answer 11

Occur because the deviation from the set point is corrected, and because the correction reduces the response of the effectors.

Question 12

Positive Feedback

Answer 12

In which a change is not reversed but intensified and the effector activity is initially increased rather than turned off. An example is blood clotting