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Pacemaker of Heart

Answer the fo...

Question

Answer the following

(i) name the major site where RBCs are formed.

(ii) Which part of heart is responsible for initating and maintaining its rhythmic activity?

(iii) what is specific in the heart of crocodiles among reptilians?

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Solution

(i) Bone marrow

(ii) SA Node (Sino Atrial Node)

(iii) Reptile have 3 chambered heart with an exception of corocodile which possess 4 chambered heart, due to the partial division of ventricle through a septum.

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Q. Which is responsible for intiating and maintaining the rhythmic contractile activity of the heart?

Q. Assertion :Sino-atrial node (SAN) is called the pacemaker. Reason: SAN generates the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractions of the heart.

Why do crocodiles besides being reptilians have a completely partioned 4 chambered heart???

Q. The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the following questions.
(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.
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Q. The diagram given represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow:

(i)

Name the phase.

(i i)

Which part of the heart is contracting in this phase? Give reason to support your answer.

(i i i)

Name the parts labelled

1

4

.

(i v)

What type of blood flows through '

2

(v)

State the function of the part '

5

(v i)

Name the membrane that covers the heart.

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