⛪Home⇐ Class V Skeletal System and Nervous System


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Class V - science: Skeletal System and Nervous System
One Word Answer Questions:
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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Short Answer Questions:
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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Long Answer Questions:
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.
muscles

Involuntary Muscles:-

  • Not Under our control.
  • Work automatically.
  • Eg:-Muscles in our stomach and intestine.
muscles2

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.
muscles3

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
  • Eg:- Hip and Shoulder
  • Allows movement in many directions
  • We can swing our arms, almost in all directions
  • Movement in one directions either up or down
  • Eg:- elbow, fingers, knees and toes
  • Found between skull and backbone helps to move our head upwards and downwards and side ways.
  • Found in wrists, ankles between ant two vertebrae of the back bone allows the bones to slide against each other.

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.
brain

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.
brain

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.
reflexaction

Sense Organs

  • Organs which connect us to the outside world are called sense organs.
  • Eyes, nose, ear, tongue, and skin are five sense organs.
sense

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.
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