Biology
The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow:
(i) Name the phase.
(ii) Label the parts 1, 2, and 3
(iii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iv) Draw well labelled diagrams of part 1 and 2 to show the structural differences between them.
Answer
(i) Atrial systole.
(ii) The parts 1, 2, and 3 are:
- 1 → Pulmonary Artery
- 2 → Superior vena cava
- 3 → Aorta
(iii) Atrial muscles are contracting during this phase because tricuspid and bicuspid valves are open while semilunar valves at the roots of pulmonary artery and aorta are closed.
(iv) Part 1 is artery and part 2 is vein. Below diagram shows the structural differences between them:
Related Questions
Give biological reasons for the following :
The wall of the ventricle is thicker than the auricles.
Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and Terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follow:
(i) Give the phenotype of F1 progeny.
(ii) Give the phenotypes of F2 progeny produced upon by the self-pollination of progeny.
(iii) Give the phenotypic ratio of F2 progeny.
(iv) Name and explain the law induced by Mendel on the basis of the above observation.
Complete the following table by filling in the blanks from 1 to 10 with appropriate terms.
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The renal cortex has a dotted appearance.