Biology
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow:
(a) Name the phase.
(b) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(c) Name the parts numbered 1 to 6.
(d) What type of blood flows through the parts marked '1' and '2' respectively?
(e) How many valves are closed in this phase?
Circulatory System
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Answer
(a) The phase is Ventricular Systole and Atrial Diastole.
(b) Ventricular muscles are contracting during this phase because the valves between the two ventricles and pulmonary artery and aorta are open while the atrio-ventricular valves are closed.
(c) The parts numbered 1 to 6 are:
- 1 → Pulmonary Artery
- 2 → Aorta
- 3 → Pulmonary Vein
- 4 → Left Atrium
- 5 → Bicuspid Valve
- 6 → Right Ventricle
(d) Types of blood flowing through parts '1' and '2' are mentioned below:
- Part 1 (Pulmonary artery) → Deoxygenated blood
- Part 2 (Aorta) → Oxygenated blood
(e) Two valves — Bicuspid and Tricuspid valves are closed in this phase.
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Related Questions
Given below is a highly schematic diagram of the human blood circulatory system.
(a) Which part (state the number) represents the heart? Give reason in support of your answer.
(b) Which numbers represent the following respectively?
Aorta
Hepatic portal vein
Pulmonary artery
Superior vena cava
Renal vein
Stomach
The figures given below show diagrammatic cross-sections of three kinds of blood vessels.
(a) Identify the blood vessels A, B and C.
(b) Name the parts labeled 1-4.
(c) Mention two structural differences between A and B.
(d) Name the kinds of blood that flow through A and through B respectively.
(e) In which one of the vessels referred to in (a) above does the exchange of gases actually take place?
Study the following diagram carefully and then answer the questions that follow:
(a) Name the cell labelled 1.
(b) Identify the phenomenon occurring in A.
(c) Mention two structural differences between 1 and 2.
(d) Name the process occurring in B and C and state the importance of this process in the human body.
Given diagram is a schematic representation of the circulatory system in humans. Study the same and answer the questions that follow :
(a) Label the parts 1 and 4 indicated in the diagram.
(b) Which of the above mentioned number is the thickest artery? Also write its name.
(c) Mention the number and chamber of the heart which has the thickest muscular wall.
(d) Which of the above numbers/structures has the maximum number of blood capillaries?
(e) Draw neat and labelled diagrams of the transverse section of vena cava and the part numbered as 3. Make sure to show the structural differences between these two in the diagram.