Buy Homeostasis Discussion Assignment

Buy Homeostasis Discussion Assignment
Buy Homeostasis Discussion Assignment
1. Choose one answer below that completes the sentence so that it makes a true
statement. Positive feedback:
A. Is the way the body maintains homeostasis
B. Is a response that opposes a stimulus
C. Is a response that maintains a dynamic state of equilibrium
D. Is a response that enhances a stimulus
Answer is D: “Positive” feedback will reinforce the stimulus, making it greater or
more insistent.
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Buy Homeostasis Discussion Assignment
2. The hypothalamus and core thermoreceptors notice if body temp is too low. The
hypothalamus signals the smooth muscle in blood vessels to vasoconstrict and
the skeletal muscle to shiver. This activity causes body temp to rise, which is
again noticed by the hypothalamus and core thermoreceptors, so the hypothalamus turns off these heat gain mechanisms. In this scenario, which of the following statements is correct?
A. The scenario describes positive feedback in action.
B. The core thermoreceptors are the effector organs.
C. The hypothalamus is the control centre.
D. The skeletal muscle is the efferent pathway to the effector organ.
Answer is C: The hypothalamus interprets the sensory input and determines the
response. Choice A is wrong as this is negative feedback. The effector organs are the
skeletal muscles (which are not a “pathway”).
3. The human body’s ability to maintain a relatively constant internal temperature
is an example of what?
A. Respiratory heat loss
B. Homeostasis
C. Vasodilation and evaporative heat loss
D. Positive feedback
Answer is B: Homeostasis is derived from words that mean remaining similar and
standing still and refers to physiological conditions remaining more or less the
same.
4. Some of the body’s homeostatic responses rely on “negative feedback”. Which
of the following happens in negative feedback?
A. The body ignores changes in a physiological variable that are directed
towards the set point for that variable.
B. The body ignores changes in a physiological variable that are directed away
from the set point for that variable.
C. The body’s response acts to oppose the change in the physiological
variable.
D. The body’s response acts to enhance the change in the physiological
variable
5. In homeostasis, what is it that produces the response that moves the physiological variable back towards the middle of its healthy range?
A. The effector
B. The receptor
C. The integrating centre
D. The efferent pathway
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6. The “afferent pathway”, in the description of a feedback loop in homeostasis,
refers to the:
A. Circulating blood
B. Pathway from the integrating centre to the effector
C. Outgoing signal
D. Path taken by the signal produced by a stimulus
Answer is D: The afferent signal is incoming from the receptor to the integrating
centre. It may be via the blood but may be via a nerve.
7. Homeostasis usually returns the body to a healthy state after stressful stimuli by:
A. Negative feedback
B. Positive feedback
C. Means of the immune system
D. Means of the nervous system
is A: Negative feedback is far more common in maintaining homeostasis
than is positive feedback.
8. What does the word “homeostasis” refer to?
A. The steps leading to repair of a blood vessel and the coagulation of blood
B. The maintenance of internal body conditions within narrow limits
C. The controlled response that opposes the influence that caused it
D. The production of blood cells in active bone marrow
9. How does homeostasis return the body to a healthy state after stressful stimuli?
By producing a:
A. Responses that oppose the stress
B. Learned behaviour
C. Reflex action
D. Buffering mechanism
10. What causes the body to maintain a relatively constant internal environment?
A. Positive feedback
B. Homeostasis
C. Reflexes
D. pH buffers
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