NPB 101D - QUIZ 1 QUESTIONS & ANSWERS
In positive feedback mechanisms, the controller/integrator acts to _____ a disturbance
a) decrease
b) increase
c) decrease and then increase
d) increase and then decrease
e) cancel - Answers -b) increase
Homeostasis is the ability of the body to
a) prevent the external environment from changing.
b) prevent the internal environment from changing.
c) quickly restore changed conditions to normal.
d) ignore external stimuli to remain in a state of rest.
e) prevent excessive blood loss. - Answers -c) quickly restore changed conditions to
normal.
Extracellular fluid
a) is the internal environment of the body.
b) is outside the cells but inside the body.
c).consists of plasma and interstitial fluid.
d) exhibits a dynamic steady state in regard to composition, temperature and volume.
e) all of these are true. - Answers -e) all of these are true.
Which of the following statements about negative feedback is INCORRECT.
a) it exists when a change in a regulated variable triggers a response that opposes the
change.
b) it exists when the input to a system increases the output and the output inhibits the
input.
c) the control system's input and output continue to enhance each other.
d) it is the method by which most of the body's control mechanisms operate.
e) it helps maintain the body dynamic, steady state - Answers -c) the control system's
input and output continue to enhance each other.
The Na+/K+ ATPase pump exists in all cells. Which of the following statements is
correct about the Na+/K+ ATPase pump?
a) is a lipid molecule in the membrane.
b) pumps 3 Na+ ions for every 2 K+ ions out.
c) is responsible for establishing and maintaining the concentration of Na+ and K+ in
cels.
d) only a and b are correct
e) a, b and c are all correct - Answers -c) is responsible for establishing and
maintaining the concentration of Na+ and K+ in cels.
In positive feedback mechanisms, the controller/integrator acts to _____ a disturbance
a) decrease
b) increase
c) decrease and then increase
d) increase and then decrease
e) cancel - Answers -b) increase
Homeostasis is the ability of the body to
a) prevent the external environment from changing.
b) prevent the internal environment from changing.
c) quickly restore changed conditions to normal.
d) ignore external stimuli to remain in a state of rest.
e) prevent excessive blood loss. - Answers -c) quickly restore changed conditions to
normal.
Extracellular fluid
a) is the internal environment of the body.
b) is outside the cells but inside the body.
c).consists of plasma and interstitial fluid.
d) exhibits a dynamic steady state in regard to composition, temperature and volume.
e) all of these are true. - Answers -e) all of these are true.
Which of the following statements about negative feedback is INCORRECT.
a) it exists when a change in a regulated variable triggers a response that opposes the
change.
b) it exists when the input to a system increases the output and the output inhibits the
input.
c) the control system's input and output continue to enhance each other.
d) it is the method by which most of the body's control mechanisms operate.
e) it helps maintain the body dynamic, steady state - Answers -c) the control system's
input and output continue to enhance each other.
The Na+/K+ ATPase pump exists in all cells. Which of the following statements is
correct about the Na+/K+ ATPase pump?
a) is a lipid molecule in the membrane.
b) pumps 3 Na+ ions for every 2 K+ ions out.
c) is responsible for establishing and maintaining the concentration of Na+ and K+ in
cels.
d) only a and b are correct
e) a, b and c are all correct - Answers -c) is responsible for establishing and
maintaining the concentration of Na+ and K+ in cels.
