Body Fluids and Circulation

Body Fluids and Circulation

Moderate Questions
Difficult Questions

Advanced Zoology

Animal Kingdom
Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Human Reproduction
Human Health and Disease
Biotechnology Principles and Processes
Biomolecules (Zoology)
Evolution (Zoology)
Biotechnology and its Applications
Reproductive Health
  1. Figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part:








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    Artery is blood vessel which receives blood from heart, has elastic thick wall showing jerky movements due to pumping activity of heart. Vein is a blood vessel which carries blood towards the heart, has wider lumen with internal valves where blood flows smoothly and slowly. Blood capillary is a very fine blood vessel which has a single layered wall. Pulmonary veins are the only veins which carry oxygenated blood. (PO2 = 95 mmHg, PCO2 = 40 mmHg)

    Correct Option: D

    Artery is blood vessel which receives blood from heart, has elastic thick wall showing jerky movements due to pumping activity of heart. Vein is a blood vessel which carries blood towards the heart, has wider lumen with internal valves where blood flows smoothly and slowly. Blood capillary is a very fine blood vessel which has a single layered wall. Pulmonary veins are the only veins which carry oxygenated blood. (PO2 = 95 mmHg, PCO2 = 40 mmHg)

  1. How do parasympathetic neural signals affect the working of the heart?








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    Control of Heart Beat by Nervous System: Medulla oblongata has two regulatory centre:
    (i) Accelerator centre - It functions through sympathetic nervous system (SNS) and increases heart beat by the secretion of epinephrine or adrenaline.
    (ii) Depressor centre - It functions through parasympathetic nervous system (PSNS) by the secretion of acetylcholine. It decreases heart beat, speed of conduction of action potential and thereby the cardiac output.

    Correct Option: A

    Control of Heart Beat by Nervous System: Medulla oblongata has two regulatory centre:
    (i) Accelerator centre - It functions through sympathetic nervous system (SNS) and increases heart beat by the secretion of epinephrine or adrenaline.
    (ii) Depressor centre - It functions through parasympathetic nervous system (PSNS) by the secretion of acetylcholine. It decreases heart beat, speed of conduction of action potential and thereby the cardiac output.

  1. Which one of the following animals has two separate circulatory pathways?








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    Whale is a mammal. It has four chambered heart having two atria and two ventricles. Oxygenated and deoxygenated blood flow in separate circulatory pathways.

    Correct Option: B

    Whale is a mammal. It has four chambered heart having two atria and two ventricles. Oxygenated and deoxygenated blood flow in separate circulatory pathways.

  1. Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:








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    The second sound heard by doctors using stethoscope occurs when semilunar valves close down after the blood flows into vesels from ventricles.

    Correct Option: B

    The second sound heard by doctors using stethoscope occurs when semilunar valves close down after the blood flows into vesels from ventricles.

  1. Blood pressure in the mamma lian aorta is maximum during:








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    The wall of left ventricle is the thickest of all the Chambers. It supplies oxygenated blood throughout the body. Aorta arises from left ventricle and the musculature is best developed.

    Correct Option: B

    The wall of left ventricle is the thickest of all the Chambers. It supplies oxygenated blood throughout the body. Aorta arises from left ventricle and the musculature is best developed.