Make your own free website on Tripod.com



HOMEOSTASIS
Test: Answers

Part A: Multiple Choice
 
1.  Homeostasis is best defined as

c) a feedback system designed to maintain body systems within an optimal range while responding to environmental or external changes.

 

2. In times of stress, under the influence of cortisol, levels of amino acids increase in the blood. Why is this change beneficial as a response to stress?

e) The amino acids are converted to glucose by the liver, raising blood sugar, thereby providing more energy to deal with stress.

 

3. Which of the following describes a negative feedback reaction?

c) LH stimulates the interstitial cell to produce testosterone, which inhibits the release of LH.

 

4. Glucagon is produced in an organ and affects target cells that are in another part of the body. The organ of production and the location of the target cells are, respectively, which of the following?

a) pancreas and liver

 

5. What makes it possible for an impulse to move from one neuron to an adjacent neuron?

e) Neurotransmitters are released from the axon terminal of one neuron and diffuse to the dendrites of the adjacent neuron.

 

6. A rapid increase in external temperature would be followed by which homeostatic adjustment in humans?

c) an increase in blood flow to the arms and an increase in perspiration.

 

7. After a severe cut to the skin, the production of urine temporarily decreases. This can be explained by the drop in blood pressure, which causes

c) the release of aldesterone, which increases Na+ reabsorption in the nephron, leading to increased water reabsorption.

 

8. Which of the following would be the result of hyper-secretion of the thyroid gland?

b) a tendency not to gain weight, a warm peripheral body temperature, and a high energy level

 

9. What is the function of memory T-cells?

b) remains in the bloodstream to promote a faster response if the same foreign antigen reappears.

 

10. In times of stress, under the influence of cortisol, levels of amino acids increase in the blood. Why is this change beneficial as a response to stress?

e) The amino acids are converted to glucose by the liver, raising blood sugar, thereby providing more energy to deal with stress.  

 

Part B: Fill in the Blanks

1. increases, release, glucose, adjustments, regulators

2. organs, increase, constriction, reduces, retains

3. autonomic sympathetic nervous, nervous

4. brain, spinal cord

5. spinal, sensory, brain

6. wastes, blood, nephron

7. permeable, NaCl, water, upper, distal, collecting

8. incoming, outgoing

9. nerves organs central nervous

10. receptor, sensory, motor, effector

11. diffusion, nerve, loses, positive, gains, positive

12. nervous, control, organs

13. cannot, insulin

14. pituitary gland

15. hormones

16. phagocytosis

17. allergies

18. immune system

19. filtration, reabsorption, secretion

20. cellular immunity, antibody immunity

 

Back

Home

Maintaining an Internal Balance | The Importance of Excreting Wastes | Chemical Signals Maintain Homeostasis | How Nerve Signals Maintain Homeostasis | The Maintenance of Balance by the Immune System | Key Terms | Quiz | Test

Enter supporting content here