Tag: evolutionary changes in heart

Questions Related to evolutionary changes in heart

In humans, blood vascular system has 

evolutionary changes in heart transportation - the circulatory system

  1. Double circulation

  2. Venous heart

  3. Arterial heart

  4. Arteriovenous heart

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Correct Option: A
Explanation:
In humans, blood vascular system has Double circulation it means we have two loops in our body in which blood circulates. One is oxygenated blood and the other is deoxygenated blood. From the heart oxygenated blood is supplied to all over the body through systemic circulation and deoxygenated blood is sent to lungs for oxygenation through pulmonary veins.
So, the correct answer is 'Double circulation'.

Serum is

evolutionary changes in heart transportation - the circulatory system

  1. Blood minus fibrinogen

  2. Lymph minus corpuscles

  3. Lymph

  4. Blood minus corpuscles and fibrinogen.

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Correct Option: D

Both avian and mammalian hearts are four chambered. The anatomy and physiology of heart is described by

evolutionary changes in heart transportation - the circulatory system

  1. Blood always enters into an atrium and then is pumped into a ventricle.

  2. Blood pressure alternates between systolic pressure and diastolic pressure.

  3. The atria provide one pump and the ventricles provide a second pump.

  4. The heart sends blood out through arteries and retrieves blood through veins.

  5. The heart pumps blood simultaneously through a pulmonary circuit and a systemic circuit.

Show answer
Correct Option: E
Explanation:

Double circulation of blood is exhibited exclusively by mammals and aves as they have a four-chambered heart. it includes systemic and pulmonary circulation. Systemic circulation includes pumping of oxygenated blood to the whole body from heart and transport of deoxygenated blood from the body to heart for oxygenation. The pulmonary circuit includes pumping of deoxygenated blood from the heart to lung for oxygenation followed by its pumping to heart. This is how four chambered heart keeps oxygenated and deoxygenated blood separate via these two circulations. 

Therefore, the correct answer is option E.

Right aortic arch is found in 

evolutionary changes in heart transportation - the circulatory system

  1. Mammals

  2. Birds

  3. Mammals and birds

  4. Reptiles

Show answer
Correct Option: A
Explanation:
Right-sided aortic arch is a rare anatomical variant in which the aortic arch is on the right side rather than on the left. During normal embryonic development, the aortic arch is formed by the left fourth aortic arch and the left dorsal aorta.
So, the correct option is 'Mammals'.