lesson - 1 Part-1
1.2 Different systems of human body
(a) Muscular system. (b) Skeletal system.
(c) Circulatorey system. (d) Digestive system.
(e) Respiratory system. (f) Integumentary system (skin)
(g) Nervous system. (h) Urinary system.
(i) Reproductive system. (j) Endocrin system.
Three types of muscles are included in muscular system:-
(a) Skeletal muscles
(b) Cardiac muscles
(c) Smooth muscles.
Functions of muscular system:-
(a) Moves the body and internal organs of body.
(b) Maintains the posture of body.
(c) Produces heat and energy.
(d) Helps in respiration.
(e) Helps to unite the body with bone.
1.2.2 Skeletal system-
The Skeletal system consists of 206 bones.
Functions of Skeletal system:-
(a) Forms the farmework of body.
(b) Protects the vital organs of body.
(c) Resists the mechanical stresses of body.
(d) Produces blood cells.
(e) 97% body calcium is stored in bone.
(f) Helps in body movement.
1.2.3 Circulatorey system-
The circulatorey system is a closed system that mainly carry blood.
Functions of Circulatorey system:-
(a) Carry O2, nutrients, vitamins, hormones etc.to tissue.
(b) Carry CO2 from tissue to lung.
(c) Carry metabolic waste products to excretory organ.
(d) Maintain water and electrolyte balanc.
(e) Regulate body temperature.
(f) Protect the body from pathogens.
1.2.4 Digestive system-
The Digestive system consist of :
(a) Digestive tract.
(b) Associated glands.
Functions of digestive system-
(a) Help in ingestion of food.
(b) Break down the complex food particles into simple form.
(c) Absorb the end products of digestion.
(d) Absorb water, vitamins, minerals drugs etc.
(e) Secretes different type of enzymes.
(f) Remove waste products after absorption of food.
1.2.5 Respiratory system-
The respiratory system consist of lungs and the passages that lead to and from lungs.
Functions of Respiratory system-
(a) Exchange of respiratory gases(O2 & CO2)
(b) Maintain acid base balance of body.
(c) Excrete some volatile substances such as acetone,alcohol,amonia.
(d) Maintain the body temperature.
(e) Maintain the water balance of body.
