Biology

Question 1

Define homeostasis

Answer 1

The tendency to resist change in order to maintain a stable, relatively constant internal environment.
-involves negative feedback loops that counteract changes of various properties from target values

Question 2

How does a negative feedback loop work?

Answer 2

Stimulus –> sensor –> control center –> effector

Question 3

What does insulin do?

Answer 3

Decreases the concentration of glucose in the blood, secreted from B cells in pancreas

Question 4

What does glucagon do?

Answer 4

Increases the concentration of glucose in the blood, released by alpha cells
causes glycogen to be broken down into glucose

Question 5

What are the four types of basic tissues?

Answer 5

• epithelial
• connective
• muscle
• nervous

Question 6

What is epithelial tissue?

Answer 6

• cover surfaces and line body cavities (skin, GI tract organs)
• polarized

Question 7

Main function of integumentary system?

Answer 7

Provides protection from injury and fluid loss and provides physical defense against infection by microorganisms; involved in temperature control
skin

Question 8

Out of arteries, arterioles, venules and veins, which has the lowest blood pressure?

Answer 8

Veins