Unit 4 Quiz

What is the primary goal of the physiological process known as homeostasis?

• To increase the body's overall size and mass.

• To generate energy for cellular respiration.

• To maintain a relatively stable internal environment despite changes in the external environment.

• To produce specialized cells for growth and repair.

What is the main characteristic of a negative feedback loop?

• It amplifies an initial stimulus to drive a process to completion.

• It works to counteract an initial change to return a condition to its normal range.

• It is the body's first response to any external threat or change.

• It is the only type of feedback loop that involves hormones.

When you get too cold, your body shivers to generate heat. This is an example of a feedback loop that works to counteract the initial change and return the body to its normal temperature. What type of feedback loop is this?

• Metabolic feedback loop

• Positive feedback loop

• Negative feedback loop

• Internal feedback loop

Which of the following is an example of a physiological process that uses a positive feedback loop?

• Blood sugar regulation

• Childbirth contractions

• Body temperature regulation

• Blood pressure control

Which of the following scenarios is an example of a negative feedback loop?

• A baby's head pressing on the cervix during childbirth, which causes stronger contractions.

• Your blood pressure increasing, which causes the heart rate to slow down.

• The release of clotting factors after a cut, leading to more clotting factors being released.

• A rise in body temperature causing shivering to generate more heat.

What is the main characteristic of a positive feedback loop?

• It works to bring a physiological condition back to its set point.

• It slows down a process to prevent it from overshooting its target.

• It amplifies an initial stimulus to drive a process to completion.

• It is used to maintain the body's core temperature.

Which of the following describes a positive feedback loop?

• The body's response is to counteract the initial change.

• It is primarily used to maintain a constant internal temperature.

• The body's response is to amplify the initial change.

• It is the most common type of feedback loop in the human body.

Which of the following scenarios is an example of a positive feedback loop?

• Blood sugar levels dropping, which causes the liver to release glucose.

• Your body's core temperature rising, which triggers sweating to cool you down.

• The release of clotting factors after a cut, leading to more clotting factors being released.

• The feeling of thirst, which causes you to drink water and restore fluid balance.

A patient is admitted to the hospital with a low body temperature (95°F). The medical team begins warming them with blankets and hot fluids. How would the body's normal homeostatic response to the low temperature aid or hinder the medical team's treatment?

• The body's response would hinder the treatment by causing the patient to sweat, working against the warming efforts.

• The body's response would hinder the treatment by causing blood vessels to dilate, losing more heat.

• The body's response would aid the treatment by causing shivering, which generates internal heat.

• The body's response would have no effect on the treatment, as it only responds to internal changes.

How do positive and negative feedback loops differ in their effect on homeostasis?

• Positive feedback loops maintain homeostasis, while negative feedback loops disrupt it.

• Positive feedback loops amplify a change, while negative feedback loops counteract a change.

• Positive feedback loops are more common in the body than negative feedback loops.

• Positive feedback loops require a stimulus, but negative feedback loops do not.