D. Answer the following questions.
1. What are the main parts of our nervous system?
4. Which is the organ of taste? Explain how it helps us to taste different types of food
2. Explain the function of the brain.
3. Explain the structure of a nerve cell with the help of a diagram.
5. How can you take care of your eyes?
6. Draw a labelled diagram showing the structure of the skin.
Answers
Answer:
1ans-brain and spinal cord
4ans-tongue is used to taste they are detected by some sort of taste buds which helps to detect different types of tastes
2ans-brain help us to give and recieve information information about our body
5ans-by not using mobiles
Step-by-step explanation:
Main parts of nervous systems are brain spinal cord and nerves
tongue is the organ of taste . If you look at your tongue in the mirror, you can see it's covered in little bumps. And in those bumps are taste buds. When you put something in your mouth, they send a message to your brain to give you information about whether the food is salty, sweet, sour, bitter or umami (a meaty, savoury taste).
brain is the centre of our body and it controls all the parts of body The brain works like a big computer. It processes information that it receives from the senses and body, and sends messages back to the body. ... Brain tissue is made up of about 100 billion nerve cells (neurons) and one trillion supporting cells which stabilize the tissue.
Structure of neuron: Nerve cells or neurons are the structural and functional units of the nervous system. It consists of three major parts namely, Cell body, dendrites, Axon.
Cell Body: It is irregular in shape or polyhedral. It contains cytoplasm and certain granular bodies called Nissles granules which contain a group of ribosomes for protein synthesis.
Dendrites: Dendrites are short fibres which branch repeatedly and protrude out of the cell body. They transmit electrical impulse towards the cyton.
Axon: They are long fibres arising from the cell body with a branched distal end. It terminates in a synaptic knob. It is filled with neurotransmitters.
Parts of Axon:
a. Axoplasm: It is the cytoplasm of an axon.
b. Myelin sheath: It is made up of many layers of Schwann cells.
c. Neurilemma: The outermost layer of Schwann cells.
d. Nodes of Ranvier: These are gaps left by a myelin sheath.
Eat a healthy, balanced diet. ...
Maintain a healthy weight. ...
Get regular exercise. ...
Wear sunglasses. ...
Wear protective eye wear. ...
Avoid smoking. ...
Know your family medical history. ...
Know your other risk factors.