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Question
What is Sinus arrhythmias?
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Solution
Sinus arrhythmias: During inspiration heart rate increases and during expirations it falls. This phenomenon is known as sinus arrhythmia.
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RELATED QUESTIONS
Which vein brings clean blood from the lungs into the heart?
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the question that follow:
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(iv) Mention one structural difference between part ‘5’ and ‘4’.
Column 2 is a list of items related to ideas in Column 1. Match the term in Column 2 with the suitable idea given in Column 1.
| Column 1 | Column 2 |
| (i) Superior vena cava | (a) Collect deoxygenated blood from the wall of the heart. |
| (ii) Inferior vena cava | (b) Carry oxygenated blood to heart muscle. |
| (iii) Pulmonary vein | (c) Collects deoxygenated blood from upper part. |
| (iv) Coronary veins | (d) Collects deoxygenated blood from lower parts. |
| (v) Coronary artery | (e) Brings oxygenated blood from lungs. |
| (vi) Aorta | (f) Large artery |
| (vii) Heart attack | (g) Large vein |
| (viii) Blood Pressure | (h) Oxygenated blood |
| (ix) Tricuspid valve | (i) Sphygmomanometer |
| (x) Bicuspid valve | (j) Allows blood flow from right auricle to right ventricle. |
| (xi) Contraction and relaxation of heart | (k) Blocking of coronary arteries. |
| (l) Cardiac muscle. | |
| (m) Allows blood flow from left auricle to left ventricle. | |
| (n) Allows blood flow from right ventricle of pulmonary aorta. |
Give scientific reason.
Human heart is called as myogenic and autorhythmic.
How are arteries and veins structurally different from one another?
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The diagram below depicts the human heart in one of its phases. Answer the questions that follow:
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