Homeostasis and Feedback Systems

What is homeostasis?

• A) A condition of imbalance in the body’s internal environment

• B) A condition of equilibrium (balance) in the body’s internal environment

• C) The process of cell division

• D) The movement of water across membranes

Tags

NGSS.HS-LS1-3

Fill in the blank: Control of homeostasis is constantly being challenged by ________ such as intense heat or lack of oxygen.

• physical insults

• hormonal changes

• nutritional supplements

• genetic mutations

Tags

NGSS.HS-LS1-3

What are the three basic components of a feedback system?

• Receptor, Control center, Effector

• Sensor, Brain, Muscle

• Monitor, Regulator, Responder

• Stimulus, Response, Recovery

Tags

NGSS.HS-LS1-3

What happens after the effectors bring about a change or response?

• The controlled condition is altered and homeostasis is restored

• The receptors stop monitoring

• The control center is deactivated

• The stimulus increases

Tags

NGSS.HS-LS1-3

Free nerve endings in the skin sense changes in temperature and may trigger shivering as a protective response to cold stress.

• True

• False

Tags

NGSS.HS-LS1-3

What do Chemoreceptors respond to?

• Chemoreceptors respond to changes in chemical concentrations (smell, taste, oxygen concentration).

• Chemoreceptors respond to changes in light intensity.

• Chemoreceptors respond to changes in temperature.

• Chemoreceptors respond to mechanical pressure or touch.

Nearly every organ or tissue can serve as an effector.

• True

• False

Tags

NGSS.HS-LS1-3

What is the basic definition of Positive Feedback?

• A process that strengthens or increases the effect of a change.

• A process that always returns a system to its original state.

• A process that weakens or decreases the effect of a change.

• A process that prevents any change from occurring.

Tags

NGSS.HS-LS1-3

Which of the following is an example of positive feedback?

• Sweating cools the body when hot

• Insulin lowers blood sugar after eating

• Childbirth: Contractions get stronger until the baby is born

• Shivering warms the body when cold

Tags

NGSS.HS-LS1-3

Which of the following is an example of negative feedback?

• Blood clotting: Platelets continue to stick together to form a clot

• Childbirth: Contractions get stronger until the baby is born

• Sweating cools the body when hot

• None of the above

Tags

NGSS.HS-LS1-3