Biology
The diagram below represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow:
(i) Name the phase.
(ii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iii) Name the parts labelled 1 to 4.
(iv) What type of blood flows through '2'?
(v) State the function of the part numbered '5'.
(vi) Name the membrane that covers the heart.
Answer
(i) Ventricular Systole.
(ii) Ventricle is contracting because both tricuspid and bicuspid valves are closed whereas both pulmonary semi-lunar and Aortic semi-lunar valves are open to pump the blood out of the two ventricles.
(iii) The parts labelled 1 to 4 are:
- 1 → Pulmonary Artery
- 2 → Aorta
- 3 → Bicuspid/Mitral valve
- 4 → Aortic Semilunar valve
(iv) Oxygenated blood
(v) Part numbered '5' are the Pulmonary Semilunar valves. They allow the deoxygenated blood to flow from the right ventricle to the lungs and prevents its backflow.
(vi) Pericardium
Related Questions
Draw neat and labelled diagrams of the following:
(i) Malpighian Capsule.
(ii) A Myelinated Neuron.
The diagram given below shows the male urinogenital system of a human being. Study the diagram and answer the questions that follow:
(i) Label the parts numbered 1 to 8.
(ii) Name the corresponding structure of part (4) in female reproductive system.
(iii) What is the role of part 7?
In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r):
(i) Draw a Punnett square to show the gametes and offspring when both the plants have heterozygous round seeds (Rr).
(ii) Mention the Phenotype and Genotype ratios of the offsprings in F2 generation.
(iii) Name the sex chromosomes in human males and females.
(iv) Briefly explain the term 'Mutation'
(v) What is the number of chromosomes in the gametes of human beings?
Explain the following terms:
(i) Greenhouse effect.
(ii) Turgor pressure.
(iii) Selective reabsorption.
(iv) Natality.
(v) Pulse.