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A&P_ Ch. 01 Module 2_ Sections 1.03-1.04 (1).
A&P_ Ch. 01 Module 2_ Sections 1.03-1.04 (1).
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A&P: Ch. 01 Module 2: Sections 1.03-1.04Which of the following does not represent a negative feedback mechanism?
a. increasing the muscle in the heart to cope with high blood pressure
b. increasing breathing rate to counter an increase in carbon dioxide
c. increasing urine output to bring down blood pressure
d. decreasing the depth of breathing when carbon dioxide levels are low -
CORRECT ANSWER-a. Increasing the muscle in the heart to cope with high blood
pressure
A home heating system connected to a temperature-sensitive thermostat is a
nonbiological example of a negative feedback system. Which of the following best
describes the heating element of the furnace?
a. variable
b. control center
c. receptor
d. effector - CORRECT ANSWER-d. effector
Which of the figures represents a full positive feedback system? - CORRECT
ANSWER-Blood Clotting; In positive feedback, the effector enhances the initial
stimulus, whereas in negative feedback, the effector reverses the initial stimulus.
In feedback, which statement is true?
a. most disease states arise from difficulties with positive feedback, which is more
common than negative feedback
b. positive and negative feedback mechanisms are named for the direction of the
response relative to the initial stimulus
c. negative feedback refers to times when levels are reduced while positive feedback
refers to times when levels are increased
d. negative feedback refers to events that often result in amplification, or a waterfall
effect. thus, they are often referred to as cascades - CORRECT ANSWER-b.
Positive and negative feedback mechanisms are named for the direction of the
response relative to the initial stimulus.
If the human body temperature drops below 37°C (98.6°F), the body's __________.
a. metabolic reactions become slower
b. metabolic reactions become faster
c. chemical reactions continue at life - sustaining rates
d. death takes place - CORRECT ANSWER-a. metabolic reactions become slower
When considering nutrients as a survival need, which of the following is true?
a. carbohydrates provide a reserve of energy-rich fuel
b. carbohydrates are the major energy fuel for body cells and are found primarily in
plant derived foods
, c. carbohydrates are the major energy fuel for body cells and are found primarily in
animal-derived foods
d. fats are the major energy fuel for body cells, and are found primarily in
animal-derived foods
e. fats are the most essential for building cell structures - CORRECT ANSWER-b.
Carbohydrates are the major energy fuel for body cells and are found primarily in
plant-derived foods.
In feedback, which statement is true?
a. due to less developed homeostatic mechanisms, young adults are more prone to
homeostatic imbalances than older adults
b. positive feedback is, in most cases, beneficial as the example of enhancing labor
contractions during birth
c. homeostasis refers to the process of positive feedback. most homeostatic control
mechanisms are positive feedback mechanisms
d. most medical situations can be viewed from the point of view of a failure of
homeostasis. disease can be regarded as a disturbance of homeostasis -
CORRECT ANSWER-d. Most medical situations can be viewed from the point of
view of a failure of homeostasis. Disease can be regarded as a disturbance of
homeostasis.
Excretion is the process of removing wastes from the body. If the body is to operate
as we expect it to, it must get rid of nonuseful substances produced during digestion
and metabolism.
Which of the following is untrue with regards to excretion?
a. carbon dioxide, a by-product of cellular respiration, is carried in the blood to the
lungs, where it leaves the body in exhaled air
b. the urinary system disposes of nitrogen-containing metabolic wastes, such as
urea, in urine
c. the digestive system rids the body of indigestible food residues in feces
d. every organ system plays a direct role in excretion - CORRECT ANSWER-d.
Every organ system plays a direct role in excretion.
Which choice below is not one of the three components of homeostatic control
systems?
a. positive feedback
b. receptor
c. control center
d. effector - CORRECT ANSWER-a. Positive feedback
Which of the following is correct regarding a feedback cycle?
a. receptor perceives a stimulus by sending input along the afferent pathway
b. receptor responds to a stimulus by sending input along the efferent pathway
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