Tag: human body and organ system

Questions Related to human body and organ system

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

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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'.

Some horses develop nose bleed during races perhaps because of

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

  1. The high cholesterol in their blood

  2. The high blood pressure involved

  3. Their need to bring down their body temperature

  4. All of the above

Show answer
Correct Option: B
Explanation:

Exercise-Induced Pulmonary Haemorrhage (EIPH), commonly known as bleeding, is the most widely recognized of all disorders affecting racehorses. EIPH is characterized by bleeding from the lungs after strenuous exercise. Research studies have shown that horses experience unusually high blood pressures within the lungs during exercise. Deep within the lung, thousands of tiny air sac or alveoli interface with capillaries, forming the blood-gas barrier. This incredibly thin barrier readily allows oxygen to move from the lungs into the blood (and carbon dioxide to move in the opposite direction). This blood-gas barrier is not sufficiently strong in horses, to withstand high stress on the capillary wall, that exist during races or intense exercise. Due to which some lung capillaries get ruptured and release blood into the airways. The term "pulmonary capillary stress failure" is also used to describe this phenomenon. 

So, the correct answer is option B.

The normal systolic and diastolic pressure in human beings is

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

  1. 80/120 mm of Hg

  2. 130/90 mm of Hg

  3. 120/80 mm of Hg

  4. 140/80 mm of Hg

Show answer
Correct Option: C
Explanation:

When the heart beats, it contracts and pushes blood through the arteries to the rest of the body. This force creates pressure on the arteries. This is called as systolic blood pressure. A normal systolic blood pressure is 120 mm hg. The diastolic blood pressure indicates the pressure in the arteries when the heart rests between beats. A normal diastolic blood pressure number is 80 mm hg.

So, the correct answer is option C.

Consider the following statements:
(a)  High blood pressure is an infectious disease.
(b)  Penicillin is effective against bacteria because it inhibits their wall formation.
(c)  AIDS spreads, through sex, blood to blood contact and from mother to child.
Which of the above statements are correct?

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

  1. (a) and (b)

  2. (b) and (c)

  3. (a), (b) and (c)

  4. None of the above

Show answer
Correct Option: B
Explanation:

High blood pressure is a non-infectious (non-communicable) condition. It is often caused by excessive weight and lack of exercise. 

Penicillin is effective against bacteria because it inhibits its reproductive cycle.
AIDS spreads, through sex, blood to blood contact and from mother to child.
So, the correct answer is option B.

Vasoconstriction causes

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

  1. Increase in heart beat

  2. Decrease in heart beat

  3. Increase in blood pressure

  4. Decrease in blood pressure

Show answer
Correct Option: C
Explanation:

Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles. When blood vessels constrict, the flow of blood is restricted or decreased, thus increasing vascular resistance causing a reduction in blood flow. Thus, vasoconstriction usually results in an increase in systemic blood pressure.

Consider the following statements regarding blood pressure.
1. It is the pressure exerted by the blood on the walls of any blood vessel.
2. It decreases in the arteries as the distance from the heart increases.
3. It is lower in the capillaries than in the arteries.
4. It is usually lower in women than in men.

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

  1. 1 and 4 are correct.

  2. 2, 3 and 4 are correct.

  3. 1 and 3 are correct.

  4. 1, 2, 3 and 4 are correct.

Show answer
Correct Option: D
Explanation:

Blood pressure (BP) is the pressure exerted by circulating blood upon the walls of blood vessels. It is usually measured at a person's upper arm. Blood pressure is usually expressed in terms of the systolic (maximum) pressure over diastolic (minimum) pressure and is measured in millimeters of mercury (mm Hg). It is one of the vital signs along with respiratory rate, heart rate, oxygen saturation, and body temperature. Normal resting blood pressure in an adult is approximately 120/80 mm Hg.

It decreases in the arteries as the distance from the heart increases.
It is lower in the capillaries than in the arteries.
It is usually lower in women than in men.

Blood enters the heart because of the 

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

  1. Auricular diastole

  2. Ventricular systole

  3. Ventricular diastole

  4. Auricular systole

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Correct Option: A
Explanation:
Blood enters from superior and inferior vena cava into the right auricle during the relaxation phase of the atrium. The pressure difference between the vena cava and the inside chamber of the right auricle allows the deoxygenated blood to enter the heart. 
So, the correct answer is option A.

Systole brings about the

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

  1. Entry of blood into lungs

  2. Entry of blood into heart

  3. Exit of blood from lungs

  4. Exit of blood from ventricles

Show answer
Correct Option: D
Explanation:

Systole refer to the contraction phase of the cardiac cycle of the heart between the first and second heart sounds of the cardiac cycle. Systole causes the contraction of the ventricles of the heart leading to ejection of blood into the aorta and pulmonary trunk.
Therefore, the correct answer is option D.