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Understanding Homeostasis in Cells Quiz

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Questions and Answers

Why is homeostasis important for living organisms?

To change internal conditions frequently

To rely on external conditions for survival

To ignore internal conditions

To maintain stable internal conditions (correct)

What is the role of negative feedback loops in maintaining homeostasis?

To introduce positive feedback loops

To amplify the disturbances

To shut off pathways when a certain product is reached (correct)

To constantly increase the internal disturbances

How does the human body respond to overheating?

By inducing shivering and blood vessel constriction

By sweating and dilating blood vessels in extremities (correct)

By conserving heat through insulation

By increasing metabolic rate

Which mechanism does the human body use to regulate glucose levels?

Releasing a hormone called insulin Signup and view all the answers

What happens when an organism's body temperature drops below the optimal level?

Shivering and blood vessel constriction occur Signup and view all the answers

Why do cells need to maintain homeostasis?

To keep internal conditions constant despite external changes Signup and view all the answers

In what way does homeostasis contribute to an organism's survival?

By keeping internal conditions stable despite external variations Signup and view all the answers

How does insulin affect blood glucose levels?

Allows cells to take up glucose, reducing blood glucose levels Signup and view all the answers

What is the role of glucagon in maintaining blood glucose levels?

Increases blood glucose levels by breaking down glycogen Signup and view all the answers

How does the presence of cholesterol in the cell membrane help maintain homeostasis?

Maintains the fluidity of the membrane Signup and view all the answers

Why are aquaporins important for the cell membrane's function?

They enhance the movement of water molecules through protein channels Signup and view all the answers

What is the primary function of ion channels in maintaining homeostasis?

Regulate the flow of ions into and out of the cell Signup and view all the answers

How does active transport contribute to maintaining ion gradients across the cell membrane?

Pumps ions against their concentration gradient using energy Signup and view all the answers

What role do ligands play in regulating ion channels within the cell membrane?

Open specific ion channels upon binding Signup and view all the answers

Why is it important for neurons to have gated ion channels?

To allow selective ion movement based on specific signals. Signup and view all the answers