1.4 Homeostasis

Multiple Choice

Why is maintaining homeostasis important for the human body?

• It allows the body to function effectively by keeping internal conditions stable.

• It helps the body grow faster.

• It increases the amount of nutrients in the body.

• It makes the body immune to diseases.

Open Ended

What are some examples of internal conditions that need to be kept within healthy limits for homeostasis?

Multiple Choice

Which of the following best describes the role of a control center in maintaining homeostasis?

• It detects changes in the environment.

• It compares current conditions to a set point and sends instructions to effectors.

• It directly causes changes in the body.

• It stores nutrients for future use.

Multiple Select

Which of the following are examples of negative feedback mechanisms in the body?

• Regulation of blood sugar by insulin and glucagon

• Blood clotting after an injury

• Childbirth contractions

• Regulation of body temperature

Multiple Choice

What is the point of a feedback loop?

• To provide the body with more energy

• To provide the body with more food

• To make sure the conditions in the body are always changing

• To make sure the conditions in the body remain stable

Multiple Choice

Organ, gland or muscle capable of being activated by nerve endings

• Control Center

• Receptor

• Effector

Multiple Choice

Which is an example of a stimulus?

• Pancreas detecting an increase in blood glucose.

• Drop in blood oxygen.

• Salivary glands increasing their release of saliva.

• Regulating blood pressure when you go from laying down to standing.

Multiple Choice

Positive feedback is when the change caused by the stimulus is

• decreased
• non existant
• increased
• changes constantly

Multiple Choice

Negative Feedback Loops:

• amplify processes
• prevent small changes from getting larger
• are initiated during childbirth
• are found only in plants

Multiple Choice

When you are cold, you shiver and your blood vessels contract, which warms you up. When you are hot, you sweat and your blood vessels expand, which cools you down.  

• Positive Feedback Response
• Negative Feedback Loop 

Multiple Choice

Rapid growth during puberty causes your body to release more and more growth hormones. As you grow, more and more growth hormones are released until puberty is reached, and then the hormones stop.

• Positive Feedback Response
• Negative Feedback Loop 

Multiple Choice

If the calcium in your blood decreases below homeostasis levels, a gland in the brain will sense the decrease and send a chemical message to your bones. Your bones will release calcium into the blood, bringing blood calcium levels back up.

• Positive Feedback Response
• Negative Feedback Loop