Tag: circulatory system

Questions Related to circulatory system

If blood pressure reads 140 systole and 90 diastole, the condition is called

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. Hypertension

  2. Normal

  3. Hypotension

  4. Ischemia.

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Correct Option: A

Blood pressure in the pulmonary artery is

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. Less than that in venae cavae

  2. Same as that in aorta

  3. More than that in carotid

  4. More than that in pulmonary vein.

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Correct Option: D

Choose the correct answer from the alternatives given.
Normal blood pressure of a- healthy person is:

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. 120/100

  2. 110/90

  3. 120/80

  4. 120/90

Show answer
Correct Option: C
Explanation:

  • Blood pressure is the pressure which is exerted by blood against the wall of the arteries. 
  • The average pressure produced in the ventricles when they contract and the blood is pumped into the aorta and the pulmonary artery is known as the systolic pressure, it is equal to the pressure exerted by a column of 120 mm of mercury. 
  • The average pressure produced in the ventricles when they relax and are filled with blood is known as the diastolic pressure, it is about 80 mm of mercury. Hence the value of blood pressure in an adult is about 120/80.
  • The blood pressure is measured by an instrument known as the sphygmomanometer.
So, the correct option is '120/80'.

Contraction drives blood through the pulmonary circuit and the systemic circuit; blood  pressure is highest in contracting 

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. atrial; ventricles

  2. ventricular; arteries

  3. atrial; atria

  4. ventricular; ventricles

Show answer
Correct Option: B
Explanation:

The ejection of blood into the arteries causes the pressure within the arteries to rise, so the ventricular blood pressure is the highest in contracting arteries.

So, the correct option is 'ventricular; arteries'.

When a person suffers from a marked fall in blood pressure, it is helpful to administer the hormone:

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. thyroxine

  2. adrenaline

  3. insulin

  4. parathormone

Show answer
Correct Option: B
Explanation:

Adrenal medulla secrets adrenaline in response to stress and emergency condition. These hormones increase alertness, pupillary dilation, sweating etc. Both the hormones increase the heartbeat, the strength of heart contraction, blood pressure, rate of respiration.

So the correct answer is adrenaline.

The main function of noradrenaline is to increase

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. cellular respiration

  2. blood pressure

  3. urine production

  4. cholesterol level

Show answer
Correct Option: B
Explanation:

Noradrenaline are rapidly secreted in response to the stress of any kind and during emergency situations and are called emergency hormones. In the rest of the  body, norepinephrine increases the heart rate and blood pressure.

So the correct option is blood pressure. 

Choose the correct answer from the alternatives given.
Aldosterone affects the regulation of sodium. It is. secreted in response. to:

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. increased blood pressure

  2. increased calcium levels

  3. decreased blood volume or cardiac output

  4. increased sodium levels

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Correct Option: C
Explanation:

When renal blood flow is reduced, the enzyme renin is secreted by the kidney cells. This promotes the conversion of angiotensinogen, produced by the liver, to angiotensin, which stimulates the production of aldosterone by the adrenal cortex. Aldosterone increases the reabsorption of sodium and water and the excretion of potassium by the kidneys. This raises the blood volume and the flow of blood through the kidneys, suppressing renin production and reducing aldosterone secretion.

So the correct answer is decreased blood volume or cardiac output. 

The hormone ANP is produced by the

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. Adrenal glands

  2. Capillary walls

  3. Kidneys

  4. Atria

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Correct Option: D
Explanation:

As stated in the passage ANP is secreted by heart atrium in response to high blood pressure when the atrial wall is stretched.

What effect does the presence of ANP have on the body ?

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. It increases the production of renin

  2. It increases the excretion of sodium and water

  3. It stimulates the production of aldosterone

  4. It stimulates the production of angiotensin

Show answer
Correct Option: B
Explanation:

As stated in the passage Renin-Angiotensin system increase blood pressure by causing retention of sodium and stimulation mineralocorticoid secretion. ANP reduces the blood pressure by excreting out sodium and excess water and vasodilation.

So, the correct answer is option B.

Atrial natriuretic factor-

biology human body and organ system blood pressure circulatory system transportation in animal and plants

  1. increases blood pressure

  2. decreases blood pressure

  3. increases absorption of $Na^+$

  4. is a vasconstrictor

Show answer
Correct Option: A
Explanation:

The atrial natriuretic hormone (ANP) is a cardiac hormone in which gene and receptors are widely present in the body. Its main function is to lower blood pressure and to control electrolyte homeostasis. So the correct option is 'Increase blood pressure'.