The Nervous System

Question 1

What’s the NVS made up of

Answer 1

Nerves like sensory motor and relay neurones, spine and brain

Question 2

What’s the job of the nervous system

Answer 2

To sense and respond to the outside environment

Question 3

Main differences between hormonal and nervous reaction

Answer 3

Hormonal control

• slow
• travel with blood
• go to whole body

Nervous control

• fast
• travel via nerves
• go to specific organ

Question 4

What is an effector and an example

Answer 4

An effector is the muscle or gland that is targeted in a nervous response. Effector is muscle in the eyelid when u blink when in contact with dust

Question 5

Job of a sensory neurone

Answer 5

To take info from receptor to the central nervous system

Question 6

5 senses

Answer 6

Smell
Sight
Taste
Touch
Hearing

Question 7

Job of motor neurone

Answer 7

Take info from central nervous system to the effector/muscle gland

Question 8

Job of relay neurone

Answer 8

Passes info within central nervous system. These are used in reflex reactions to pass info straight from a sensory neurone to a motor neurone, bypassing the brain

Question 9

What are the different sense organs, and what do they sense

Answer 9

Eye>light
Skin>touch
Temperature
Pressure
Pain

Question 10

What does the nervous system and hormones enable us to do

Answer 10

Respond to external changes. Help control conditions in our body. Hormones are used in forms of contraception. Plants also produce hormones like auxin and respond to external stimuli

Question 11

What are receptors and what do they detect

Answer 11

Detect changes in the environment. Receptors in eyes sensitive to light. Receptors in ears sensitive to sound. Receptors in ears that are sensitive to changes in position and enable us to keep our balance.receptors in nose and tongue sensitive to chemicals and enable us to taste and smell. Receptors in skin that are sensitive to touch, pressure, pain and to temperature changes.

Question 12

What do light receptors contain

Answer 12

Nucleus,cytoplasm,cell membrane

Question 13

How is information passed through the nervous system

Answer 13

Information from receptors passes along cells (neurones) in nerves to the brain. The brain coordinates the response. Reflex actions are automatic and rapid. They often involve sensory, relay and motor neurones.

Question 14

What happens in a reflex action

Answer 14

Impulses from receptor pass along sensory neurone to central nervous system. At a synapse between sensory and relay neurone a chemical is released that causes impulse to be sent along a relay neurone. Chemical is then released between a relay and motor neurone in the central nervous system causing impulses to be sent along motor neurone to the organ (effector) that brings about the response. The effector either a muscle responds by contracting and a gland by releasing chemical substances.

Question 15

What do we need to control in the human body

Answer 15

Water- leaves body via lungs when breathing out and via skin when we sweat to cool. Excess water is lost via the kidneys in urine.

Ions-lost via skin when we sweat and excess ions are lost via kidneys in urine

Temperature- maintain one that enzymes work best at

Blood sugar level- provide cells with constant supply of energy