WorksheetsHomeostasis and Thermoregulation
Total questions: 19
Worksheet time: 10mins
What role do shunt vessels play in body temperature regulation?
Insulating the body
Constricting or dilating to affect blood flow
Producing sweat
Causing hair to stand
How do hair erector muscles contribute to homeostasis in cold conditions?
By producing sweat
By causing hair to stand
By dilating blood vessels
By insulating the body
Define ‘homeostasis’. Why is homeostasis such an important process?
It maintains a constant internal environment.
It allows for rapid changes in body temperature.
It increases the rate of metabolism.
It decreases the body's energy consumption.
What are the parts of the skin that are involved in temperature regulation?
Sweat glands and blood vessels.
Hair follicles and nails.
Epidermis and dermis only.
Melanin and keratin.
Which of the following is a correct example of homeostasis?
More antidiuretic hormone (ADH) is produced to increase the reabsorption of water by the collecting duct in the kidney.
Glucagon is secreted to reduce the level of glucose in the blood.
Increased ventilation rate reduces the oxygen content of blood.
Vasodilation decreases blood flow to the skin in order to conserve heat.
The diagram shows a section through skin. Which structure secretes sweat to cool down the skin temperature?
Structure A
Structure B
Structure C
Structure D
The increase in blood flow to the skin during exercise is so that __________________.
carbon dioxide is lost
oxygen is gained
heat is lost
water is lost
Identify structure A in the diagram of a section through the skin of a mammal.
Nerve ending
Hair erector muscle
Sweat gland
Blood capillary
Identify structure E in the diagram of a section through the skin of a mammal.
Hair
Blood capillary
Sweat gland
Nerve ending
What happens to structure A in cold environments?
It expands to release heat.
It contracts to trap air and reduce heat loss.
It secretes more sweat.
It increases blood flow to the skin.
What are the main ways in which heat is lost and gained by the body?
Through digestion and absorption.
Through vasoconstriction and vasodilation of arterioles.
Through bone growth and repair.
Through muscle contraction and relaxation.
What causes the increase in blood flow to the capillaries on a hot day?
Vasoconstriction of the arterioles.
Vasodilation of the arterioles.
Decrease in metabolic rate.
Increase in muscle contraction.
How does an increase in blood flow help to regulate temperature?
It decreases the amount of heat lost through the skin.
It increases the amount of heat retained in the body.
It allows more heat to be lost through radiation, convection, and conduction.
It reduces the activity of sweat glands.
What happens to body temperature during exercise?
It decreases below 37 °C.
It remains constant at 37 °C.
It increases above 37 °C.
It fluctuates randomly.
What is the role of sweat glands in temperature regulation?
They produce oil to cool the skin.
They secrete sweat, which evaporates and removes heat.
They trap heat within the body.
They increase blood flow to the skin.
What process occurs to increase heat loss through the skin during exercise?
Vasoconstriction
Vasodilation
Sweating cessation
Increased muscle activity
Why should a sailor stranded on an island avoid drinking seawater?
It will increase the water potential of the plasma.
It will lead to dehydration due to high salt concentration.
It will decrease the secretion of antidiuretic hormone (ADH).
It will cause the kidney tubules to reabsorb less water.
What physiological change causes an athlete's face to appear red after running a race?
Decrease in blood flow to the skin.
Constriction of blood arterioles near the skin surface.
Dilation of blood arterioles near the skin surface.
Decrease in muscle activity.
What happens to the body temperature of a boy who fell into ice-cold water and then removed his clothes?
The body temperature increases due to heat absorption.
The body temperature remains constant.
The body temperature decreases due to evaporation.
The body temperature increases due to muscle activity.
