Circulatory Pathways LEVEL 3 MCQs Body Fluids and Circulation Biology - XI NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Identify the incorrect statement regarding transport of respiratory gases in humans:

1.	Blood is the medium of transport for O₂ and CO₂.
2.	About 97 per cent of O2 is transported by RBCs in the blood.
3.	Nearly 70 per cent of CO2 is transported by RBCs.
4.	About 7 per cent of CO2 is carried in a dissolved state through plasma

Subtopic: Human Heart: Cardiac Cycle | Atherosclerosis, Hypertension & Ventricular Fibrillation | Circulatory Pathways |

88%

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The sino-atrial node is the normal pacemaker of the human heart primarily because:

1.	it is made up of special cardiac muscle.
2.	it is richly innervated by autonomic nerve fibres.
3.	it is located in the posterior wall of the right atrium.
4.	it depolarizes at the fastest rate out of the whole nodal tissue.

Subtopic: Human Heart: Double Circulation | Circulatory Pathways |

72%

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