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If a person has lost a significant amount of blood but still maintains a normal blood pressure it does not necessarily mean that the person is maintaining adequate perfusion. Which of the following best explains why this is so?
a. Blood vessels are constricting causing greater peripheral resistance.
b. The heart has increased its rate to increase cardiac output.
c. The sympathetic nervous system has increased its nerve impulses.
d. The heart has increased its contractile force increasing cardiac output.

Respuesta :

olayemiolakunle65

Answer:

a. Blood vessels are constricting causing greater peripheral resistance.

Explanation:

Peripheral vascular resistance means the resistance in the circulatory system that is used to control blood pressure and the flow of blood. When blood vessels constrict, there would be an increase in systemic vascular resistance. When blood vessels dilate, there would be a decrease in systemic vascular resistance.

blessinglovely41

Answer: The correct answer in (A)

Blood vessels are constricting causing greater peripheral resistance.

Explanation: When there is hypovolemia (significant loss of blood),there is decreased amount of blood in circulation and lesser blood is being returned to the heart,a positive feedback mechanism stimulates the body system to release catecholamines which brings about increased peripheral resistance and causes the heart to contract more.

The blood vessel lumen narrows/constrict bringing about peripheral vascular resistance and increased pressure of blood flow thereby maintaining a stable/normal blood pressure.

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