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The open circulatory system is present in:

(A) Arthropods (Insects)

(B) Annelids

(C) Chordates

(D) Molluscs

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Important Questions on Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Assertion (A): Heart of fishes is called branchial heart.
Reason (R): It receives deoxygenated blood from body parts.
The correct option among the following is
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Purkinje fibres are located in the following structure/s
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Calculate the cardiac output on an individual having 70 heartbeats/min with a stroke volume of 55 mL.
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level

Match the following related to the cardiac cycle.

Column I Column II
i Cardiac Cycle a 0.2 sec
ii Atrial Systole b 0.4 sec
iii Ventricular Systole c 0.1 sec
iv Cardiac Diastole d 0.8 sec
    e 0.3 sec
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Match the Column - I with Column - II:
  Column – I   Column II
a P – wave i Depolarisation of ventricles
b QRS complex ii Repolarisation of ventricles
c T – wave iii Coronary ischemia
d Reduction in the size of T - wave iv  Depolarisation of atria
    v Repolarisation of atria

Select the correct option
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Assertion (A): Pulmonary aorta in human embryo communicates with systemic aorta by a thin vessel called ductus arteriosus.
Reason (R): In the heart of the human embryo, oxygenated and deoxygenated blood is completely separated.
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
In a standard ECG, one of the following functions of its components is not correctly interpreted.
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Write notes on the working of the heart of man.
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
The QRS complex in a standard ECG represents:
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level

Assertion (A): Dub' is one of the sounds of the heart caused during a cardiac cycle.

Reason (R): The sound is due to closure of semilunar valves present at the bases of aortic arches.

EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level

The diagram below shows a typical ECG.

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If the AV node is not functional, which of the following options correctly represents the changes seen in the ECG?

EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Match the different types of heart given in column A with organisms given in column B. Choose the correct combination.
 
Column A Column B
P. Neurogenic heart. i. Human
Q. Bronchial heart. ii. King crab
R. Pulmonary heart. iii. Shark
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Sketch and label the conducting system of human heart.
EASY
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level

Recognize the figure and find out the correct matching?

Question Image

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level

In the electrocardiogram, QRS complex stands for:

Question Image

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Describe the structure of the heart of man with the help of a neat labelled diagram.
HARD
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Explain the internal structure of human heart. (diagram not necessary)
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level

Statement (S): The sinoatrial node is called 'Pace-maker'.

Reason (R): The sinoatrial node contains specialised cardiomyocytes and generates action potentials without any external stimuli.

The correct answer is

MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?  
MEDIUM
Life Sciences>From Molecules to Organisms: Structures and Processes>Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.>Structure and Function - Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level
Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when: