Page 183 - 86 human physiology part-2

Chapter 20

• A) Negative feedback
B) A malfunctioning control system
C) Positive feedback
D) A negative impact

6.Which of the follow is an example of a positive feedback?

A) Shivering to warm up in a cold winter storm
B) A cruise control set on your car applies more gas when going up a hill
C) You sweat on a hot summer's day and the blood vessels in your skin vasodilate
• D) You get cut and platelets form a clot. This in turn activates the fibrin clotting system
and more blood forms clots

7.Where is the body's "thermostat" found?

• A) Within the nervous system, in the Hypothalamus
B) Within the integumentary system, in the skin
C) Within the brain, in the corpus callosum
D) Within the Urinary system, in the kidneys

Cell physiology

1. List 2 functions of the cell membrane:

Separates internal metabolic events from the external environment.
Controls the movement of materials into and out of the cell.

Questions 2 - 6 Match the following organelles with their function:

2. Mitochondria C

3. Vacuoles D

4. Cilia A

5. Smooth ER B

6. Golgi Apparatus E

7. The diffusion of H2O across a semi permeable or selectively permeable membrane is termed

A. Active transport
B. Diffusion
• C. Osmosis
D. Endocytosis

8. Oxygen enters a cell via?

398 | Human Physiology