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WHEN WE SLEEP OUR HEAD FLOP.
When we are awake the muscles in our neck and back hold us and our head upright.When we nod off, those muscles relax and our head falls to one side .Muscles do more than just support us -by pulling our bones they produced every movement from lifting a pen to running a race.
MUSCLES ARE OF THREE TYPES.
SKELETAL MUSCLES- It pulls on bones so we can move our body.
SMOOTH MUSCLES- These are found in the walls of hollow organs , such as bladder.
CARDIAC MUSCLES- These are found in the walls of the heart, it constantly contracts to pump blood.
Muscles are made up of long cylindrical cells called fibers .Nerve fibers carry signals from the brain that make the muscles fibers contract. Blood vessels carry oxygen and food to the muscles fibers .
FACIAL EXPRESSIONS ARE CREATED BY MUSCLES-
More than thirty small muscles pull on the skin of the face to produce the expression that reveal how we feel .Some common expressions are -
FEAR- In this , muscles pull the lower jaw downwards to open mouth wide.
ANGER- In this , muscles pull the eyebrows downward making them wrinkle .
JOY- In this expression ,the muscles pull and lift the corners of the mouth.
SURPRISE- In this expression ,the muscles raise the eyebrows and make the forehead wrinkle
SADNESS. -In this expression ,muscles pull the corners of the mouth downwards.
THREE TYPES OF FITNESS RELATING MUSCLES.
STAMINA- It measures how efficiently our heart pumps blood.
STRENGTH -It measures how strong our muscles are.
FLEXIBILITY- It measures , how flexible our joints, tendons, and muscles are.
INTERESTING FACTS.-
Massage & RelaxationWhen we are awake the muscles in our neck and back hold us and our head upright.When we nod off, those muscles relax and our head falls to one side .Muscles do more than just support us -by pulling our bones they produced every movement from lifting a pen to running a race.
MUSCLES ARE OF THREE TYPES.
SKELETAL MUSCLES- It pulls on bones so we can move our body.
SMOOTH MUSCLES- These are found in the walls of hollow organs , such as bladder.
CARDIAC MUSCLES- These are found in the walls of the heart, it constantly contracts to pump blood.
Muscles are made up of long cylindrical cells called fibers .Nerve fibers carry signals from the brain that make the muscles fibers contract. Blood vessels carry oxygen and food to the muscles fibers .
FACIAL EXPRESSIONS ARE CREATED BY MUSCLES-
More than thirty small muscles pull on the skin of the face to produce the expression that reveal how we feel .Some common expressions are -
FEAR- In this , muscles pull the lower jaw downwards to open mouth wide.
ANGER- In this , muscles pull the eyebrows downward making them wrinkle .
JOY- In this expression ,the muscles pull and lift the corners of the mouth.
SURPRISE- In this expression ,the muscles raise the eyebrows and make the forehead wrinkle
SADNESS. -In this expression ,muscles pull the corners of the mouth downwards.
THREE TYPES OF FITNESS RELATING MUSCLES.
STAMINA- It measures how efficiently our heart pumps blood.
STRENGTH -It measures how strong our muscles are.
FLEXIBILITY- It measures , how flexible our joints, tendons, and muscles are.
INTERESTING FACTS.-
- There are 640 skeletal muscles in the human body.
- The longest muscle in our body is the Sartorial muscle.It s length is 50 cm.It is a thigh muscle.
- The shortest muscle in human body is the Stampedes.It length is only 0.5cm .It is located in our ear.
- When a muscle stays contracted ,when it should have relaxed,it causes cramp and pain.To prevent cramp , stretch before exercise.
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