8B.2b - Senses and Systems

Question 1

Name the 5 senses, and the organs involved (10)

Answer 1

1. Hearing (and balance) - EARS
2. Sight (eyes)
3. Touch (skin)
4. Taste (tongue)
5. Smell (nose)

Question 2

What’s the name of the system of organs that controls the body?

Answer 2

Central nervous system

Question 3

What are the components of the Central Nervous System? (4)

Answer 3

1. Brain
2. Spinal cord
3. NERVES, with
4. SENSORS

Question 4

Explain the steps by which we SENSE and REACT (5, with 5 for explanations)

Answer 4

1. Sensors DETECT a STIMULUS
2. A signal/impulse is SENT along nerves to the SPINE/BRAIN
3. An ACTION is DECIDED upon, either in the spine or in the brain
4. A signal is SENT BACK along nerves to the MUSCLES
5. Our muscles MOVE to react REACT to the STIMULUS

Question 5

Give an example of a decision that may take place in the spine

Answer 5

Surprising sharp pain from stepping on a pin. Jump up without thinking,

Question 6

Give an example of a decision that may take place in the brain

Answer 6

Smell of a fart in the air. Open car window.

Question 7

What else do animals use (other than nerves) to send information about the body? (2)

Answer 7

HORMONES, which are CHEMICAL MESSENGERS in the blood.

Question 8

Are Hormones slower or faster than nerves at sending signals?

Answer 8

Slower

Question 9

Give 2 examples of what hormones control.

Answer 9

Puberty, growth, development, blood composition

Question 10

Do plants sense anything?

Answer 10

Yes, they can sense light, water, direction. But they react a lot slower.