1.While learning to ride a bicycle Satish lost his balance and fell down. He got a cut on his knee and it started bleeding. His sister Sujata on seeing this asked him tow put pressure on the area with a clean handkerchief. She immediately rushed to her home to call her parents.
(a) How does apply pressure to a bleeding wound help?
(b) When we get small bruises, bleeding stops automatically after some time. Why?
(c) What would be the colour of the wounded area? Why?
(d) Which type of blood cells are responsible for clotting of blood?
(e) What value of Sujata is shown here?
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Answers
Explanation:
a). as blood has flow and pressure it will tend to move out rapidly leading to loss of blood. to avoid this pressure from outside helps to minimize the loss of blood from wound.
b). small bruises are nothing but internal bleedings so blood clots sooner and the bleeds from scratches is sealed up by the fibrin fibres which help in clotting by trapping blood cells inside and not letting them out. small wounds have less area to cover to be sealed so that's why they heal sooner.
c). the wounded area might be bluish or blackened by the rupture of blood vessels inside or it can be reddened due to inflammation.
d). platelets are the blood cells responsible for its clotting.
e). Sujata with the help of her knowledge of first aid helps to prevent further bleeding thus, it shows us that she is a kind and knowledgeable person.
Answer:
Explanation:
a). as blood has flow and pressure it will tend to move out rapidly leading to loss of blood. to avoid this pressure from outside helps to minimize the loss of blood from wound.
b). small bruises are nothing but internal bleedings so blood clots sooner and the bleeds from scratches is sealed up by the fibrin fibres which help in clotting by trapping blood cells inside and not letting them out. small wounds have less area to cover to be sealed so that's why they heal sooner.
c). the wounded area might be bluish or blackened by the rupture of blood vessels inside or it can be reddened due to inflammation.
d). platelets are the blood cells responsible for its clotting.
e). Sujata with the help of her knowledge of first aid helps to prevent further bleeding thus, it shows us that she is a kind and knowledgeable person.