Science - Using digested food
Terms
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- Parts of the circulatory system
-
heart
arteries
veins
capillaries - Function of blood
-
1. Transport of oxygen to all cells of the body.
2. Transport of nutrients to each cell of the body.
3. Transport of wate materials to the excretory organs.
4. Transport of hormones.
5. Controld of inorganic substances like sodium, potassium and other minerals in the body. These elements help maintain the fluid balance, that is the correct amount of water in blood and other tissues.
Protection of the body against germs.
Transport of heat and control of the body temperature. - function of oxygen in the blood
- helps the cells to breakdown glucose to give energy
- formula of glucose
- C6H12O6
- How does blood move through the arteries?
- Heart acts like a pump. Due to continuous copntraction and relaxation of the heart muscles the blood is pumped into the arteries.
- What is pulse?
- The continuous pumping action of the heart is felt as the pulse.
- Average pulse of an adult
- 70
- average pulse of a newborn baby
- 140
- Aveage pulse of a three year old
- 100
- quantity of blood the heart pumps every day
- 15,000 litres
- How long does it take the total amount of the blood in the body to pass through the heart?
- once every 24 seconds
- Reasons for increased pulse rate.
-
Exercise
when we are scared
when we have fever - Function of the arteries
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1. Carry blood from the heart to the various organs.
2. Carry pure blood except the pulmonary artery, which carries impure blood from the heart to the lungs.
3. Thick muscular walls to withstand the pressure of the pumped blood.
4. Deep seated.
5. Blood in arteries flow with pressure
6. Blood in arteries red in colour.
7. Do not have valves - Function of the veins.
-
1. Carry blood from the various organs to the heart.
2. Carry impure blood except the pulmonary vein, which carries pure blood from the lungs to the heart.
3. Thin muscular walls.
4. superficial, lies below the skin.
5. Blood in veins flow slowly.
6. Blood in veins darker in colour.
7. Veins have valves which prevent the blood from flowing backwards in the veins. - Main artery from the heart to the body parts is called
- aorta
- branching of arteries
- Arteries branch into arterioles and then into fine capillaries.
- branches of veins
- Capillaries join up to form venules. Venules join together to form veins
- Name the most important tissue in the circulatory system
- Blood
- Parts of the blood.
-
White Bood cells (WBC)
Red blood cells (RBC)
Platelets
All these float in the liquid called plasma. - Function of the WBC
- Responsible for fighting disease.