NCERT Class 7 Science Chapter 11: Transportation in Plants and Animals (NSO/NSTSE) | English

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Dr. Manishika Jain explains NCERT Class 7 Science Chapter 11: Transportation in Plants and Animals

Circulatory System @0:48
Blood Vessels @0:56
RBC @3:46
WBC @4:13
Platelets @4:26
Heart @4:49
Heartbeat @7:12
Excretion in Animals @8:13
Excretory System in Humans @8:30
Kidney @9:34
Transportation of Substances in Plants @13:03
Transpiration @14:11
#Organisms #Sponges #Tricuspid #Pulmonary #Precious #Ventricle #Arteries #Platelets ##Intestine #Digested #Manishika #Examrace

BRAIN TEASERS
Pulmonary artery carries pure or impure blood? Reason.
___ forms capillaries and these join to form ____
Impure blood enters which chamber of heart??
Who was known as “circulator”?
Difference between egestion and excretion..
Is ammonia an excretory product?
What is suction force and importance of root hairs?

LET’S BEGIN!!

Transport of food and waste material takes place

Circulatory System
Blood is the fluid which flows in blood vessels.
• It transports substances like digested food from the small intestine to the other parts of the body.
• It carries oxygen from the lungs to the cells of the body.
• It also transports waste for removal from the body.
It is made of plasma in which various cells are suspended
Includes
• RBC – red by haemoglobin. Haemoglobin binds with oxygen and transports it to all the parts of the body and ultimately to all the cells
• WBC – fight against germs
• Platelets: formation of clots – color changes to dark red
Blood Vessels
• Arteries - carry oxygen-rich blood from the heart to all parts of the body (Since the blood flow is rapid and at a high pressure, the arteries have thick elastic walls and flow only in one direction even without valves)
• Veins – carry carbon dioxide-rich blood from all parts of the body back to the heart, thin walls, have valves and allows blood to flow only towards heart
• Capillaries – arteries divide into extremely thin tubes when reaching tissues – join to form veins that empty into heart.
• Pulse rate - throbbing is called the pulse and it is due to the blood flowing in the arteries. Number o beats per minute is pulse rate and is between 72 & 80 beats per minute
Voluntary blood donation is harmless and painless and can save

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