Class 11 Biology Important Chapter 15 Body Fluids and Circulation Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Biology Important Solutions and select need one. AHSEC Class 11 Biology Additional Notes English Medium Download PDF. HS 1st Year Biology Important Solutions in English.
Class 11 Biology Important Chapter 15 Body Fluids and Circulation
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 11 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Biology Important Notes in English for All Chapters, You can practice these here.
Body Fluids and Circulation
Chapter: 15
| IMPORTANT QUESTION AND ANSWER |
Very Short and Short Answer Type Question:
1. Name the chemicals secreted by basophils.
Ans. Basophils liberate histamine, heparin and serotonin.
2. Blood group O can be transfused with blood group O only. Why?
Ans. Because of no antigen on RBC and have antibodies to antigen A & B in plasma.
3. Describe chordae tendineae.
Ans. Ventricles have fibrous cords called chordae tendineae.
4. Why is heart failure also called congestive heart failure?
Ans. It is called congestive heart failure because of congestion of lungs.
5. What is semilunar valve found in heart?
Ans. Opening of right and left ventricle into pulmonary artery and aorta respectively has semilunar valves.
6. What is coronary artery disease?
Ans. Narrowing of lumen of Coronary Arteries occur due to deposits of cholesterol, fat, fibrous tissues with calcium.
7. What are two important functions of circulatory system?
Ans. (i) The circulatory system supplies food, oxygen, enzymes, hormones and other substances to the different cells of the body.
(ii) It carries the end products of metabolism to the organs which excrete them.
8. Where does the cardiac impulse originate?
Ans. The cardiac impulse originates in cardiac muscle fibres and is not brought to the heart by any nerve fibres. The origin of cardiac impulse is said to be myogenic.
9. How is flow of blood maintained in single direction in blood circulatory system?
Ans. The valves located in the heart and blood vessels maintain the flow of blood in single direction in blood circulatory system.
10. What is joint diastole?
Ans. During blood circulation when both the atria and ventricles are in relaxed phase, it is called joint diastole.
11. What transmits the cardiac impulse from the atria to the ventricles?
Ans. Atrioventricular Node (AV Node) collects the wave of contraction generated by SA Node and passes down to ventricles. SA node determines the rate of heart beat; so it is also called pacemaker of the heart.
12. What is the rate of heart beat?
Ans. Our heart beats for 70 to 80 times in a minute. The average rate of heart beat is 72 times/minute.
13. What is atrial pulse?
Ans. It is the wave of distention that passes along the arteries immediately following the ventricular systole.
14. Which of the four chambers of the human heart has the thickest muscular walls?
Ans. Left ventricle.
15. Define cardiac diastole.
Ans. After contraction of the ventricles the heart rests for 0.4 of a second and this period is known as cardiac diastole.
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