B1- Coordination and Contol

Question 1

Name three stimuli which affect humans.

Answer 1

Light,sound and chemicals

Question 2

What effect does oestrogen have on FSH production?

Answer 2

It inhibits the release of FSH

Question 3

State two internal conditions that need to be controlled.

Answer 3

Water,minerals and ions

Question 4

How are impulses transmitted across a synapse?

Answer 4

By means of chemical

Question 5

What type of cells detects a change in the environment?

Answer 5

Receptor

Question 6

Name a plant hormone?

Answer 6

Auxin

Question 7

What is gravitropism?

Answer 7

Respond of a root to gravity

Question 8

Why do plants shoots bend towards light?

Answer 8

The growth hormone auxin causes the side of the shoot away from the light to grow more so it becomes longer

Question 9

How does the contraceptive pill work?

Answer 9

It contains hormones which inhibits FSH so that the egg does not mature.

Question 10

Why are FSH and LH given in fertility treatment?

Answer 10

FSH cause the egg to mature. LH stimulates ovulation ( egg release).

Question 11

Describe the sequence of events in a reflex action.

Answer 11

Stimulus -> receptor -> sensory neuron -> relay neuron -> motor neuron -> effector -> response