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Homeostasis Review



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

1. 

The hormone FSH stimulates the development of a follicle in the human female. As the follicle develops, it secretes estrogen. A high level of estrogen decreases the secretion of FSH. This mechanism is an example of
a.
cell differentiation
c.
in vitro fertilization
b.
positive tropism
d.
negative feedback
 

2. 

The two systems that directly control homeostasis in most animals are the
a.
nervous and endocrine systems
c.
nervous and locomotive systems
b.
endocrine and excretory systems
d.
excretory and locomotive systems
 

3. 

During a long-distance run on a hot day,an athlete produces large quantities of sweat.As a result,the kidneys change the rate of urine production.Why is this change important?
a.
Decreased urine production increases the amino acids in the blood.
b.
Increased urine production removes amino acids produced as a result of running.
c.
Decreased urine production allows the body to conserve water.
d.
Increased urine production allows more water to remain in the bloodstream.
 

4. 

The diagram below represents the actions of two hormones in the human body.
le_homeostasis_review_files/i0050000.jpg
This diagram best illustrates
a.
recombination
b.
feedback
c.
insertion
d.
deletion
 

5. 

A student is frightened by a loud noise, which results in a hormone being released into the blood.  The hormone causes the student's heart to beat rapidly.  The two systems that work together to cause this reaction are the endocrine system that secretes the hormone and the
a.
nervous system
c.
excretory system
b.
reproductive system
d.
digestive system
 

6. 

Which important human process is represented by the following statement:
     gland -> secretes -> chemical -> transported -> organ -> change occurs
a.
coordination
b.
digestion
c.
excretion
d.
cell respiration
 

7. 

If a human system fails to function properly, what is the most likely result?
a.
a stable rate of metabolism
b.
a disturbance in homeostasis
c.
a change in the method of cellular respiration
d.
a change in the function of DNA
 

8. 

Which statement describes a feedback mechanism involving the human pancreas?
a.
The production of estrogen stimulates the formation of eggs for sexual reproduction.
b.
The level of oxygen in the blood is related to heart rate.
c.
The level of sugar in the blood is affected by the amount of insulin in the blood.
d.
The production of urine allows for excretion of cell waste.
 

9. 

An example of a human response is
a.
the secretion of a hormone
c.
the buzz of a bee
b.
a stone approaching the eye
d.
the fragrance of a rose
 

10. 

Which hormone lowers blood sugar levels by increasing the rate of entry of glucose into the cells?
a.
follicle-stimulating hormone
c.
parathormone
b.
adrenalin
d.
insulin
 

11. 

An important method of communication between cells in an organism is shown in the diagram below.
le_homeostasis_review_files/i0120000.jpg

What is the chemical referred to in the diagram?
a.
a hormone important in maintaining homeostasis
b.
an enzyme detected by a cell membrane receptor
c.
DNA necessary for regulating cell functions
d.
a food molecule taken in by an organism
 

12. 

Homeostasis is illustrated in the human body by the effects of insulin on the amount of
a.
proteins digested
c.
oxygen transported to the lungs
b.
amino acids absorbed into the blood
d.
glucose in the blood
 

13. 

A person was admitted to the hospital with abnormally high blood sugar and an abnormally high sugar content in his urine. Which gland most likely caused this condition by secreting lower than normal amounts of its hormone?
a.
pancreas
b.
parathyroid
c.
salivary
d.
thyroid
 

14. 

To communicate between cells, many multicellular animals use
a.
nerve signals and respiratory gases
c.
bones and muscles
b.
respiratory gases and hormones
d.
nerve signals and hormones
 

15. 

Increased perspiration, a higher body temperature, and a rapidly beating heart are all possible responses to a stressful situation. These body responses are most likely a direct result of the interaction of the
a.
digestive and endocrine systems
c.
digestive and respiratory systems
b.
nervous and reproductive systems
d.
nervous and endocrine systems
 

Short Answer
 
 
le_homeostasis_review_files/i0180000.jpg
 

16. 

In the diagram above, state one possible cause for the failure of muscle E to respond to a stimulus at A.
 

17. 

The graph below shows the relationship between kidney function and arterial pressure
in humans.

le_homeostasis_review_files/i0200000.jpg

State how a steady decrease in arterial pressure will affect homeostasis in the human
body.
 

18. 

How does insulin affect blood sugar levels?
 

19. 

The diagram below represents a function of the thyroid gland.

le_homeostasis_review_files/i0220000.jpg
State one effect of an increasing level of TSH-releasing factor.
 

20. 

During hot weather and vigorous exercise, people sweat.  As the water on their skin evaporates, the water molecules absorb heat energy.  Why is this process important to the individual?
 

21. 

Many different feedback mechanisms have evolved over time.  These mechanisms allow an organism to respond to changes in both its internal and external environment.  Select an organism from those you have learned about and describe how a specific feedback process works within that organism.  Include how the feedback specifically helps the organism maintain homeostasis.
 



 
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