Topic B5- Homeostasis and Response

Question 1

What is homeostasis?

Answer 1

Maintaining a stable internal environment

Question 2

What are three main components, which work together to maintain a steady condition in the body?

Answer 2

Receptors, Coordination centres and effectors

Question 3

Explain the three steps of negative feedback, when the level of something in the body gets too high?

Answer 3

1) receptor detects a stimulus - level is too high
2) the coordination centre receives and processes the information, then organises a response.
3) effector produces a response which counteracts the change and restores the optimum level -the level decreases.

Question 4

What is a stimulus?

Answer 4

A change in the environment

Question 5

What does the central nervous system consist of in vertebrates?

Answer 5

The Brain and spinal cord

Question 6

What are the receptors?

Answer 6

The cells that detect stimuli

Question 7

What do the sensory neurons do in the body?

Answer 7

Carry information as electrical impulses from the receptors to the CNS

Question 8

What do the motor neurons do in the body?

Answer 8

Carry electrical impulses from the CNS to effectors

Question 9

What are the effectors?

Answer 9

All the muscles and glands, which respond to nervous impulses

Question 10

How do muscles and glands respond to nervous impulses?

Answer 10

Muscles contract, whereas glands secrete hormones

Question 11

What does the central nervous system do with the information from the receptors?

Answer 11

Coordinates a response