Bio 1023 exam- BRCC| Questions and Correct
Answers| Latest 2025
How can an organ be made up of both cells and tissues? - ✔✔Organs are made up of
tissues, Tissues are made up of cells, so organs are made up of both cells and tissues
True/False: Different organs working together for a common function make up an organ
system - ✔✔true
Homeostasis: - ✔✔the maintenance of a relatively stable internal environment even
when the external environment changes
Vasoconstriction: - ✔✔the reduction in diameter of blood vessels, which helps to
retain heat
Vasodilation: - ✔✔the expansion in diameter of blood vessels, which helps to release
heat
Hypothalumus: - ✔✔a master coordinator region of the brain responsible for a
variety of physiological functions
Feedback loop: - ✔✔A pathway that includes input from a sensor, a response via an
effector, and detection of the response by the sensor
Explain how the following processes help maintain a constant body temperature in
humans.
, a. Shivering and Vasoconstriction: - ✔✔Shivering generates heat because to contract,
the muscles must carry out cellular respiration, releasing energy as heat.
Vasoconstriction conserves heat; it reduces the diameter of surface blood vessels and
redirects blood to the body core, which controls the temperature of the vital organs.
This movement of blood toward the body core also decreases the amount of heat loss
through the skin
Explain how the following processes help maintain a constant body temperature in
humans.
b. Vasodilation and Sweating: - ✔✔Vasodilation increases the diameter of surface
blood vessels to promote heat loss through the skin. (This is the reason you look red, or
flushed, when you are hot.) Sweating works through evaporative cooling, or the use of
water to release heat into the environment. Vasodilation and sweating are similar to
vasoconstriction and shivering in that they work to maintain temperature homeostasis
in your body. These two groups of processes differ in that vasoconstriction and shivering
prevent your body from getting too cold and vasodilation and sweating prevent it from
getting too hot
Which of the following is NOT maintained by homeostasis in humans?
A. blood-glucose level
D. percentage of body fat
B. body temperature e. blood pH
C. none of the above - ✔✔percentage of body fat
When the body gets too cold, the _____ send(s) signals to the hypothalamus, which in
turn signal(s) the _____
a. sensors; blood vessels below the skin to constrict
b. hypothalamus; blood vessels under the skin to dilate
c. sensors; blood vessels under the skin to dilate
Answers| Latest 2025
How can an organ be made up of both cells and tissues? - ✔✔Organs are made up of
tissues, Tissues are made up of cells, so organs are made up of both cells and tissues
True/False: Different organs working together for a common function make up an organ
system - ✔✔true
Homeostasis: - ✔✔the maintenance of a relatively stable internal environment even
when the external environment changes
Vasoconstriction: - ✔✔the reduction in diameter of blood vessels, which helps to
retain heat
Vasodilation: - ✔✔the expansion in diameter of blood vessels, which helps to release
heat
Hypothalumus: - ✔✔a master coordinator region of the brain responsible for a
variety of physiological functions
Feedback loop: - ✔✔A pathway that includes input from a sensor, a response via an
effector, and detection of the response by the sensor
Explain how the following processes help maintain a constant body temperature in
humans.
, a. Shivering and Vasoconstriction: - ✔✔Shivering generates heat because to contract,
the muscles must carry out cellular respiration, releasing energy as heat.
Vasoconstriction conserves heat; it reduces the diameter of surface blood vessels and
redirects blood to the body core, which controls the temperature of the vital organs.
This movement of blood toward the body core also decreases the amount of heat loss
through the skin
Explain how the following processes help maintain a constant body temperature in
humans.
b. Vasodilation and Sweating: - ✔✔Vasodilation increases the diameter of surface
blood vessels to promote heat loss through the skin. (This is the reason you look red, or
flushed, when you are hot.) Sweating works through evaporative cooling, or the use of
water to release heat into the environment. Vasodilation and sweating are similar to
vasoconstriction and shivering in that they work to maintain temperature homeostasis
in your body. These two groups of processes differ in that vasoconstriction and shivering
prevent your body from getting too cold and vasodilation and sweating prevent it from
getting too hot
Which of the following is NOT maintained by homeostasis in humans?
A. blood-glucose level
D. percentage of body fat
B. body temperature e. blood pH
C. none of the above - ✔✔percentage of body fat
When the body gets too cold, the _____ send(s) signals to the hypothalamus, which in
turn signal(s) the _____
a. sensors; blood vessels below the skin to constrict
b. hypothalamus; blood vessels under the skin to dilate
c. sensors; blood vessels under the skin to dilate
