Review: Homeostasis and Feedback (Video Notes)

A set of 15 question-and-answer flashcards covering definitions and concepts of homeostasis, negative and positive feedback, plant and unicellular examples, and related topics from the video notes.

What is homeostasis?

The body's process of responding to a stimulus to maintain balance or stable internal conditions.

Which processes in the human body are regulated by negative feedback loops?

pH of blood, blood glucose, internal body temperature, and pupil size.

How does a negative feedback loop help restore homeostasis?

It detects a deviation from normal and reverses the change to bring conditions back toward normal.

What can occur if a negative feedback loop malfunctions?

Illness, disease, or injury; identifying the cause and fixing it may be necessary.

Name three aspects of human homeostasis mentioned in the notes.

Body temperature, heart rate, and blood sugar levels.

Which organ regulates blood sugar levels?

The pancreas.

What plant structure opens and closes to regulate gas exchange?

Stomata.

What is hydrotropism?

The growth of plant roots toward water.

How do Paramecia regulate their water balance when environmental salt levels change?

They use contractile vacuoles to pump water out of the cell.

What is a positive feedback loop?

A loop that amplifies a deviation from normal conditions rather than reversing it.

Give two examples of positive feedback in the body.

Childbirth and blood clotting.

Do all organisms maintain homeostasis?

Yes — not only humans, but plants and unicellular organisms do as well.

What role do stomata play in plant homeostasis?

Stomata regulate gas exchange (oxygen, carbon dioxide, and water vapor) by opening and closing.

What does hydrotropism illustrate in plants?

A growth response toward water availability in the soil.

What topic is covered by the Amoeba Sisters video referenced in the notes?

Homeostasis and feedback mechanisms.