B10

Question 1

What is homeostasis?

Answer 1

Process of keeping everything constant as possible internal conditions cells to internal and external changed

Question 2

What do internal conditions control?

Answer 2

-body temp
-water content of the body
-body gluclose concentration

Question 3

What are the key features of control system?

Answer 3

-Receptor: cells that detect changes of internal or external environment
-Coordination centres: areas that recieve information from the receptor sending out signals and coordinate the response of the body such as:
- brain
- spinal cord
- pancreas
- Effectors: muscle or glands that bring about responses to the stimulus and stores conditions in the body

Question 4

What are the two parts of the nervous system?

Answer 4

• central nervous system (CNS)
• periphal system -> other nerves running to and from the CNS

Question 5

How does the nervous system work?

Answer 5

Once a sensory receptor detects stimulus information is sent as an eletircal impulse neurone. Impulse travels to neurone reaching to the CNS implises from sense organ known as the sensory neurone. Brain gets information sends impulses along special cells motor neurones carrying information to the body effectors respond

Question 6

What is reflexes?

Answer 6

When you touch something hot/sharp you move your hand before the pain. If something comes near your face you blink automatic responses

Question 7

What are reflexes for?

Answer 7

• Help avoid danger or harm
• Take care of your basic body function
• Includes breathing and moving food through

Question 8

What are the three types of neurones

Answer 8

• sensory neurone
• motor neurone
• relay neurone - connect sensory neurone and motor neurone

Question 9

How do reflexes work?

Answer 9

An electrical impulse passes from the receptor along the sensory neurone to the CNS. It then passes along a relay neurone (usually in the spinal cord) and straight back along the motor neurone. From there, the impulse arrives at the effector organ. The effector organ will be a muscle or a gland.

Question 10

Sum how the nervous system works?

Answer 10

Stimulus -> receptor -> coordinator (CNS) -> effector

Question 11

What is the sensory nerve?

Answer 11

Carries impulses to the CNS information proceeded impulsing out along motor nerves produce an action

Question 12

What is the reflex pathway?

Answer 12

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