Why do we call our heart myogenic? | Class 11 Biology Chapter Body Fluids and Circulation, Body Fluids and Circulation NCERT Solutions

Welcome to the NCERT Solutions for Class 11 Biology - Chapter Body Fluids and Circulation. This page offers a step-by-step solution to the specific question from Exercise 1, Question 9: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 9: Why do we call our heart myogenic?

Answer:

In the human heart, contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium. The SA node has the inherent power of generating a wave of contraction and controlling the heart beat. Hence, it is known as the pacemaker. Since the heart beat is initiated by the SA node and the impulse of contraction originates in the heart itself, the human heart is termed myogenic. The hearts of vertebrates and molluscs are also myogenic.

Other Questions of Chapter Body Fluids and Circulation

Q: What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?

Q: Describe the evolutionary change in the pattern of heart among the vertebrates.

Q: Column I Column II
(a) Eosinophils (i) Coagulation
(b) RBC (ii) Universal Recipient
(c) AB Group (iii) Resist Infections
(d) Platelets (iv) Contraction of Heart
(e) Systole (v)Gas transport

Q: Draw a standard ECG and explain the different segments in it.

Write the differences between:
(a) Blood and Lymph
(b) Open and Closed system of circulation
(c) Systole and Diastole
(d) P-wave and T-wave

Q: Why do we consider blood as a connective tissue?

What is the difference between lymph and blood?

Q: Define a cardiac cycle and the cardiac output.

Q: What is the importance of plasma proteins?

Q: Sino-atrial node is called the pacemaker of our heart. Why?

Popular questions of class 11 Biology

Q: Describe briefly the four major groups of Protozoa.

Q: Why are living organisms classified?

Q: State two economically important uses of: (a) Heterotrophic bacteria (b) Archaebacteria

Q: What is the difference between direct and indirect development?

Define a taxon. Give some examples of taxa at different hierarchical levels.

Q: Describe the important properties of enzymes.

What are the steps involved in formation of a root nodule?

Q: Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.

Q: How is a key helpful in the identification and classification of an organism?

Q: What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

Recently Viewed Questions of Class 11 Biology

Name the pathological condition when uncontrolled cell division occurs.

Aquatic animals generally are ammonotelic in nature where as terrestual forms are not. Comment.

Name the cells/tissues in human body which
a. exhibit ameboid movement
b. exhibit ciliary movement

Q: How is the study of plant anatomy useful to us?

How do you distinguish between a skeletal muscle and a cardiac muscle?

Q: Explain the term thecodont and diphyodont.

Why earthworm is called the friend of farmer?

Q: Draw the labelled diagram of the following:
(i) Gram seed
(ii) V.S. of maize seed

Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities
occur during mitosis?
a. Nuclear membrane fails to disintegrate
b. Duplication of DNA does not occur
c. Centromeres do not divide
d. Cytokinesis does not occur.

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Body Fluids and Circulation.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Comments

Rushi
Mar 22, 2020

Thank for help me to easy to understand and easy to learn tq a lot

Sagar Barman
Aug 27, 2019

Thanks,for making the answer so easyðððð

Varshini R Gowda
Aug 21, 2019

Tq a lot it helped me to score marks in subjective examination

Safi ahmad
Feb 09, 2019

Thanks for help me

Neelav
Dec 09, 2018

Thanks for help...

Siyana
Dec 14, 2017

Good

umar basha
Sep 04, 2016

thanx a lot for clearing my doubt

rupal
Jan 20, 2016

Why we call our heart with a name heart why we don't call it with other name?

karan
Jun 07, 2015

Thanks... For helping me.