DP SEHS A.1.2 Maintaining homeostasis (Part 1)

Why is homeostasis important for the body?

• It helps the body grow faster

• It allows the body to function properly in different environments

• It increases the amount of oxygen in the blood

• It decreases the need for food

If the body did not maintain homeostasis, what could happen during exercise in the heat?

• The body would function normally

• The internal environment could become unbalanced

• The body would become stronger

• The body would cool down too quickly

Which of the following is an example of an environmental stressor?

• Injury

• Low glucose levels

• Altitude

• Body temperature

Which process involves the regulation of blood pressure, heart rate, and body temperature?

• Homeostasis

• Photosynthesis

• Metamorphosis

• Fermentation

What would happen if negative feedback mechanisms failed in the body?

• Homeostasis would be disrupted

• Blood pressure would always be high

• Heart would stop beating

• No change would occur

Which neurotransmitter is released by the parasympathetic branch to slow the heart rate?

• Epinephrine

• Norepinephrine

• Acetylcholine

• Serotonin

Which node's firing rate is slowed by acetylcholine?

• AV node

• SA node

• Purkinje fibers

• Bundle of His

Which of the following is a direct result of sympathetic stimulation of the heart?

• Decreased heart rate

• Increased heart rate

• No change in heart rate

• Heart stops beating

Which of the following statements is true about the autonomic nervous system?

• It only affects the digestive system

• It controls voluntary muscle movement

• It has both sympathetic and parasympathetic branches

• It is not involved in heart function

What is the main function of involuntary control in the body?

• To consciously move muscles

• To respond to a range of stimuli to maintain homeostasis

• To store glucose in the liver

• To increase voluntary actions