Nerves and Coordination

Nerves and Coordination

By Sunnie Sun

Multiple Choice

The human nervous system consists of:

the central nervous system (CNS) and

the peripheral nervous system

• True

• False

Multiple Choice

The central nervous system (CNS) is made up of

• The spinal cord and legs

• the brain and spinal cord

• the brain and other smaller nerves

• the brain, the arms and hormones

Multiple Choice

The peripheral nervous system consist of the

• nerve cells that carry information to or from the CNS

• brain that functions to coordinate the entire body

• nerves and muscles

Description of a neurone

Neurone​

• they have a long fibre (axon) which is insulated by a fatty sheath

• they have tiny branches (dendrons) which branch further as dendrites at each end

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Draw

Nerve cells are also called neurones. They are adapted to carry electrical impulses from one place to another. Complete the drawing of what you think a neurone would look like

Draw

Label: 1. cytoplasm

2. nucleus

3. nerve ending

4. axon

5. dendrite

6. myelin sheath

7. cell body

cell body and dendrite

​✘The cell body is the control center of the neuron and contains the nucleus of the cell.

✘

✘The dendrites reach out from the cell body and receive messages from receptors (sensory neurons) or other cells (motor neurons).

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Axon and axon terminal

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The axon (or nerve fibre) sends the signal only in one direction: away from the cell body.

​

The axon terminal passes the signal on to the next neuron.

​myelin sheath

​✘Neurons are covered in a myelin sheath which acts very much like an insulator on an electrical wire; insulating the neuron from electrical signals from other neurons, and also increasing the speed of the signal.

Multiple Select

Select organs that are sense organs

• tongue

• heart

• kidney

• skin

• eye

Multiple Choice

Sense organs contain a group of specialised cells called ....................... They can detect a change in the environment (stimulus) and produce electrical impulses in response.

• sensors

• receptors

• cytoplasm

Multiple Select

Effectors are parts of the body - such as muscles and glands - that produce a response to a detected stimulus. Choose correct examples for the situation

• a muscle contracting to move an arm

• muscle squeezing saliva from the salivary gland

• a gland releasing a hormone into the blood

From stimulus to response ​

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From stimulus to response