Blood pressure towards the brain during rest hours is:
Correct answer: C. 750mm/minute
- A. 850mm/minute
- B. 900mm/minute
- C. 750mm/minute
- D. 730mm/minute
Explanation
Cerebral circulation refers to the flow of blood through the network of blood vessels supplying the brain. The arteries deliver oxygenated blood, glucose, and other nutrients to the brain and the veins carry deoxygenated blood back to the heart, removing carbon dioxide, lactic acid, and other metabolic products. The four main arteries that supply blood to our brain are the left and right internal carotid arteries and the left and right vertebral arteries. When cerebral circulation is impaired, less oxygen and glucose reach the brain. This can cause brain damage and neurological problems. The rate of blood flow toward the brain during rest is 750ml/minute.This is a value to be memorized from the following table given in KPK Biology Book 1.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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