Tag: biology

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Questions Related to biology

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

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

  1. thyroxine

  2. adrenaline

  3. insulin

  4. parathormone
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

The main function of noradrenaline is to increase

  1. cellular respiration

  2. blood pressure

  3. urine production

  4. cholesterol level
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

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

  1. increased blood pressure

  2. increased calcium levels

  3. decreased blood volume or cardiac output

  4. increased sodium levels
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Atrial natriuretic factor-

  1. increases blood pressure

  2. decreases blood pressure
  3. increases absorption of $Na^+$

  4. is a vasconstrictor
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Some horses develop nose bleed during races perhaps because of

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

The normal systolic and diastolic pressure in human beings is

  1. 80/120 mm of Hg

  2. 130/90 mm of Hg

  3. 120/80 mm of Hg

  4. 140/80 mm of Hg
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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?

  1. (a) and (b)

  2. (b) and (c)

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

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Vasoconstriction causes

  1. Increase in heart beat

  2. Decrease in heart beat

  3. Increase in blood pressure

  4. Decrease in blood pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
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.