E.
Answer the following questions.
1. Briefly explain the transport of water and minerals in plants.
Describe, in brief, the function of heart.
2.
3.
State the functions of the three types of blood vessels.
Give one function each of RBC, WBC and platelets.
4.
5.
Draw a neat and well labelled diagram of the human excretory system.
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Answers
Answer:
The components of the transport system in human beings are the heart, blood, and blood vessels. The function of the heart is to pump oxygenated blood throughout the body and receives deoxygenated blood from the various body parts and sends this impure blood to the lungs for oxygenation. Blood has three main functions: transport, protection, and regulation. Blood transports the following substances: Gases, namely oxygen between the lungs and rest of the body. Nutrients from the digestive tract and storage sites to the rest of the body. The function of blood vessels is to transport blood throughout the body.
Q2. How is oxygen and carbon dioxide transported in human beings?
Answer: Oxygen and carbon dioxide in human beings are transported in various ways. The majority of oxygen, that is 97%, is transported as oxyhaemoglobin, a combined state of oxygen and haemolgoin.
The remaining oxygen is present in the form of dissolved oxygen in blood plasma. The majority of carbon dioxide, that is about 70%, is transported in the form of bicarbonate in the blood plasma.
This bicarbonate is involved in maintaining the pH of the blood. About 23% of carbon dioxide is transported in the form of carbminohaemoglobin, a combined state of carbon dioxide and haemoglobin. The remaining 7% is present in the form of dissolved carbon dioxide in plasma.
Q.3 Name the body structure concerned with the given functional activity: Combines with the oxygen in the lungs
Answer: The Haemoglobin in the blood combines with the oxygen in the lungs to form oxyhaemoglobin. The oxyhaemoglobin is then transferred to the different parts of the body. So, the correct answer is ‘haemoglobin’.
Q4. pH of human blood is
Answer: pH is the measure of acidity or basicity of a substance, which ranges from 0 -14. Blood has a pH in the range of 7.35 to 7.45 making it slightly basic. Blood having a pH below than 7.35 is considered acidosis and above 7.45 is considered to be alkalosis.
Answer:
It is very big question
Explanation: