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Q) Which part of the body protects our brain?
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Q) How does cartilage help us?
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Q) What is a skeleton?
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Q) Names of the two sense organs?
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Q) Name three main parts of the nervous system?
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Q) Breathing system?
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Q) The main parts of human skeleton are?
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Q) The place where two bones meet is called a?
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Q) Breaking food helps us?
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Q) A gas which we breath in is?
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Q) What is Muscles?
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Q) What is Cartilage?
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Q) What is brain?
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Q) What is Back Bone and Limbs?
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Q) What is Skull and Rib Cage?
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Q) Explain briefly about sense organs?
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Q) Explain briefly about Nervous System?
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Q) Explain briefly about Types Of Joints?
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Q) Explain briefly about Functions Of Skeletal System?
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Q) Explain briefly about Organ system?
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Q) Explain about Skeletal System and Organ System?
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Q) What are the functions Of Skeletal System?
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Q) What are the types of joints?
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Q) Explain about Nervous System?
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Q) Explain about Sense Organs?
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Q) Explain in detail about four kinds Movable joints?
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Q) Explain in detail about Skull and Rib Cage?
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Q) Explain in detail about Back Bone and Limbs?
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Q) Explain in detail about Voluntary Muscles and Involuntary Muscles?
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Skeletal System And Organ System
Organ system:-
- A group of organs that work together to perform a particular job for the body.
Skeletal system:-
- Frame work of bones that gives shape, support and strength to our body.
- All adult human skeleton has 206 bones of different shapes and sizes.
Skull:-
- Adult human being has 22 bones.
- Upper portion protects our brain.
- All bones in the skull are fixed except the bones in the lower jaw that can move.
Rib Cage:-
- Ribs are thin and curved bones.
- Make a cage around our chest.
- This cage is known as rib cage.
- Protects our heart and lungs.
- 12 pairs of ribs.
- Last two pairs are free and called floating ribs.
Back Bone:-
- Made up of 33 small bones called vertebrae.
- The vertebrae join together to form a strong column called the vertebral column.
- It is flexible and protects the delicate spinal cord.
Limbs:-
- Our skelton has two pairs of limbs.
- Fore limbs (arms) used for doing different tasks such as writing, lifting and pulling the objects.
- The hindlimbs are used for walking and running.
Functions Of Skeletal System
- It gives shape and support to the body.
- It protects the delicate internal organs like brain, spinal cord, heart and lungs.
- Move our body with the help of muscles.
Cartilage:-
- Tough elastic substance.
- Holds bone in its place.
- Prevents bones from wear and tear.
- Without cartilage bones will rub each other and wear out.
- Our nose and ears have cartilage.
Muscles:-
- Bone cannot move without muscles.
- Muscles are made up of tough elastic tissues.
- They are attached to the bone by strong fibers called tendons.
- We have three types of muscles.
Voluntary Muscles:-
- Muscles that are under our control are called voluntary muscles.
- Eg:-Muscles of arms & legs.
Involuntary Muscles:-
- Not Under our control.
- Work automatically.
- Eg:-Muscles in our stomach and intestine.
Cardiac Muscles:-
- Type of involuntary muscles found in the walls of heart.
- Not under our control.
- Make our heart to beat.
- Cardiac muscles work throughout our life and never get tired.
Types Of Joints
- The place where two bones meet is called a joint.
- They may be movable ( can move freely) or immovable ( do not allow any movement between the bones).
Movable joints are of four kinds
| Ball and socket Joint | Hinge Joint | Pivot Joint | Gliding Joint |
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Nervous System
- It controls all other body systems and sense organs.
- Walking, laughing, thinking, and weeping are controlled by the nervous system.
Brain:-
- All the activities are controlled by our brain.
- Has memory to store and can recall the information when needed.
- Brain is at the top of the spinal cord and is protected by skull.
- 3 main parts.
Cerebrum:-
- Largest part of brain controls our sense organs helps to remember things and understand meanings and solve problems.
Cerebellum:-
- Small part and lies below the cerebrum.
- Controls our muscles activities and helps us to balance our body.
Medulla:-
- Joins brain to the spinal cord.
- Heart beat, breathing, and sneezing are controlled by medulla.
- It is active even when we sleep.
Nerves:-
- A network of nerves to carry messages between the brain and other parts of the body.
Spinal Cord:-
- A bunch of nerves that connects the brain with all the body parts.
- Starts from the back portion of the brain and continues down to the lower end of our backbone.
- Protected by the vertebral column.
Reflex actions:-
- An automatic reaction of the body to an event.
- Eg:- when we touch something hot our hand automatically pulls itself away.
- Brain is not involved.
- They are controlled by the spinal cord.
Sense Organs
- Organs which connect us to the outside world are called sense organs.
- Eyes, nose, ear, tongue, and skin are five sense organs.
Eyes:-
- The Sense organs of sight, eye brows and eye-lashes protect our eyes from sweat and dirt.
Nose:-
- Helps us to smell various things.
- We breathe through it.
Ears:-
- Sense organs of hearing.
- We are able to hear various sounds with the help of our ears.
- Help us to keep our balance.
Tongue:-
- Sense organs of taste.
- 4 kinds of taste buds.
- Help us to taste sweet, sour, salty and bitter food items.
Skin:-
- Sense organs of touch and feeling has nerve ending that help us to feel, cold and pain.