Unit 4: Homeostasis

Question 1

Define: Homeostasis

Answer 1

The maintenance of conditions within a cell or body within acceptable limits

Question 2

What are regulators?

Answer 2

Organisms that require a very constant internal environment, not allowing our conditions to vary too much.

Question 3

What are conformers?

Answer 3

Organisms that allow their internal environment to vary more based on the environment.

Question 4

What is contact signalling?

Answer 4

Cells that need one-to-one contact to communicate (local one-to-one)

Question 5

What is paracrine signalling?

Answer 5

One cell secretes a chemical (called the secreting chemical) that goes to many different target cells locally (local one-to-many)

Question 6

What is synaptic signalling?

Answer 6

Far away signalling between one cell and another. Ex: neurons (Remote one-to-one)

Question 7

What is endocrine signalling?

Answer 7

Where one cell send many different items (ex. Hormones) to many cells from a distance (remote one-to-many)

Question 8

What are the steps (in order) of the mechanism of communication between cells?

Answer 8

Stimulus - Receptor - Processor - Effector - Response (repeat)