Cell Communication and Feedback Loops

A process in which an initial change will bring about more change in the same direction.

• negative feedback

• positive feedback

• homeostasis

• neutral feedback

Which of the following is not true about homeostasis?

• it is how the body maintains a constant environment

• it is controlled by positive feedback loops

• it is controlled by negative feedback loops

• it is a characteristic of all living organisms

Tags

NGSS.HS-LS1-3

Which of the following is not an example of a negative feedback loop?

• body maintaining a temperature of about 37°C

• release of ADH to increase H₂O reabsorption when dehydrated

• a ripe apple releasing ethylene, which causes more ripening

• heart rate increasing when exercising to deliver more O₂ to cells

Tags

NGSS.HS-LS1-3

What do cells have in order to respond to a particular hormone?

• a receptor for the hormone

• nothing as any hormone can affect any cell at any time

• an effector for the hormone

• a plasma membrane

Tags

NGSS.HS-LS1-3

If the environment gets cold, we will often shiver in order to:

• keep body temperature the same as the external temperature
• decrease body temperature
• increase body temperature
• regulate blood pressure

Tags

NGSS.HS-LS1-3

The two types of feedback systems that help organisms maintain homeostasis are:

• positive and negative 
• receptor and effector
• static and dynamic
• minor and major

Tags

NGSS.HS-LS1-3

Maintaining body temperature is an example of a:

• negative feedback loop
• positive feedback loop

Tags

NGSS.HS-LS1-3

When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. This is an example of a:

• Positive Feedback Loop

• Negative Feedback Loop

Tags

NGSS.HS-LS1-3

Which of the following scenarios describes a positive feedback mechanism?

• After childbirth, high levels of prolactin induce lactation in the mother. During nursing, infant suckling triggers the release of more prolactin, which further stimulates lactation.

• After eating, blood glucose levels rise, stimulating the release of insulin from the pancreas. Insulin causes cells to uptake glucose from the blood, lowering blood glucose levels.

• several hours after a meal, blood glucose levels begin to drop, prompting the pancreas to secrete glucagon. Glucagon causes the liver to convert stored glycogen into glucose, raising blood glucose levels.

• During exercise, an increase in body temperature causes the body to produce sweat. As the sweat vaporizes, the body cools down due to evaporative cooling.

Tags

NGSS.HS-LS1-3

What is another word that can be used to describe "homeostasis"?

• equal

• complete

• stable

• correct

Tags

NGSS.HS-LS1-3