Biology · General Awareness

Human Circulatory System

818 Questions

The human circulatory system explores the network of blood vessels, heart valves, and structural pathways. Test items often target blood flow sequences and specific vascular functions. Mastering these details is vital for biology preparation.

Heart valves and chambersBlood vessels and venulesArteries of the bodyBlood supply to organsCentral nervous system supply

Human Circulatory System Questions

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

Blood pressure in the pulmonary artery is

  1. More than that in the carotid

  2. More than that in the pulmonary vein

  3. Less than that in the vense cavae

  4. Same as that in the aorta
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The blood pressure in the arteries is greater than that in the veins.
Artery > Arteriole > Capillary > Venule > Vein (Vena Cava) 
The pulmonary artery is a short and stout (wide) structure which branches into two parts. On the other hand the pulmonary veins are large blood vessels. Hence, the pressure of blood is greater in the pulmonary artery as compared to that in the pulmonary vein.
So, the answer is B.
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.
Blood pressure is high in and lowest in

  1. Arteries; veins

  2. Arteries; ventricles

  3. Arteries; relaxed atria

  4. Arterioles; veins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During systole, because of heart contraction blood is pumped into arteries. Blood pressure is highest as it leaves the heart through the aorta and gradually decreases as it enters smaller and smaller blood vessels (arteries, arterioles, and capillaries). While during atrial diastole, both atria are relaxing, dilating and filling. Blood pressure drops to the lowest level during this state. 

So, the correct option is 'Arteries; relaxed atria'.

Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

System of vessels and tubes in animals is called as

  1. Digestive system

  2. Circulatory system

  3. Respiratory system

  4. Reproductive system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Human circulatory system, also called the blood vascular system consists of a muscular chambered heart, a network of closed branching blood vessels and blood, the fluid which is circulated. It is essentially a network of tubes that supplies to all living cells essential nutrients, O$ _2$ and other essential substances. Also, the waste or harmful substances produced are removed continuously for the healthy functioning of tissues.

Multiple choice biology transport in mammals regulation of the activity of heart drug, tobacco and alcohol consumption community health and hygiene

Which of the following statements is not true?

  1. Regulation of blood vessel diameter originates from the vasomotor centre of the pons

  2. Baroreceptors may stimulate the vasomotor center

  3. Chemoreceptors are particularly sensitive to blood levels

  4. Cerebral cortex can play a role in regulating blood pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The vasomotor center is a portion of the medulla oblongata, that together with the cardiovascular & respiratory centers regulates blood pressure too.

So, the correct option is 'Regulation of blood vessel diameter originates from the vasomotor center of the pons'.

Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F)?
(i) Proteins contribute 6 - 8% of the blood plasma.
(ii) Plasma contains very high amount of minerals.
(iii) Plasma without the clotting factors is called serum.
(iv) Glucose, amino acids, lipids, etc., are also present in the plasma as they are always in transit in the body.

  1. i - F

    ii - F

    iii - T

    iv - T

  2. i - T

    ii - F

    iii - T

    iv - T

  3. i - T

    ii - T

    iii - F

    iv - F

  4. i - F

    ii - F

    iii - F

    iv - T
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood plasma contains dissolved proteins (6–8%) (i.e.—serum albumins, globulins, and fibrinogen), glucose, clotting factors, electrolytes, hormones, CO$ _2$ and oxygen.

Though plasma contain substantial amount of minerals but the concentration in terms of percentage can not be defined as 'high amount' in terms of their presence in plasma.
Blood plasma without clotting factor is called serum.
Thus, the correct answer is' i - T, ii - F, iii - T, iv - T.'

Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

Which of the following components are present in the plasma?

  1. Water

  2. Salt

  3. Proteins

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

One half of blood is composed of red blood cells, white blood cells and platelets which are considered as solid part of blood and another half is composed of water, salts and proteins which is the fluid part of blood. The fluid part of blood is known as plasma. Hence the components present in the plasma are water, salts and proteins.

So, the correct answer is 'All of the above'.

Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

Most of the blood proteins are 

  1. Acidic

  2. Basic

  3. Neutral

  4. All the above in equal proportions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plasma is composed of 90-92% water and 6-8 % plasma proteins. Fibrinogen, globulins and albumins are the major proteins. The pH of blood is 7.35 to 7.45 slightly alkaline. Most of the blood proteins are acidic in order to neutralize the pH of blood.

So, the correct answer is 'Acidic'.

Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

The major proteins of blood plasma are

  1. Albumin, globulin and fibrinogen.

  2. Collagen, elastin and fibrinogen.

  3. Albumin, glutelin and p-protein.

  4. Actin, myosin and tubulin.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
One half of blood is composed of red blood cells, white blood cells and platelets which are considered as solid part of blood and another half is composed of water, salts, and proteins which is the fluid part of blood. The fluid part of blood is known as Plasma. Plasma is a straw-colored, viscous fluid it has about 90-92% water and 6-8% proteins. The major proteins of blood plasma are Albumin, globulin, and fibrinogen.
So, the correct answer is 'Albumin, globulin, and fibrinogen'.
Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

Observe the following statements and select which are true or false?
(1) Plasma constitutes 45% of the human blood.
(2) Albumin is a plasma protein which helps in osmotic balance.
(3) Factors responsible for the blood clotting process are present in the blood.
(4) Plasma without clotting factors is called serum.
(5) Minerals are not generally found in blood.

  1. Only 5 is wrong and all others 1 to 4 are correct.

  2. 1 and 2 are correct and 3, 4 and 5 are wrong.

  3. 2 and 4 are correct and 1, 3 and 5 are wrong.

  4. 1 and 5 are correct and 2, 3 and 4 are wrong.

  5. 2, 3 and 4 are correct and 1 and 5 are wrong.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Albumin protein in plasma is responsible for maintaining osmotic balance. Plasma constitutes about 55% of the human blood and blood cells constitute 45% of the human blood. Minerals like sodium, potassium, calcium regulate normal blood pressure. Blood clotting factors are present in blood. Serum is the plasma from which clotting factors have been removed. 

Thus, the correct answer is option E. 

Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

................. part of the blood carries minerals, vitamins, sugar and other foods to the body's cells.

  1. Plasma

  2. Platelets

  3. Red blood corpuscles

  4. White blood corpuscles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood is made up of plasma and corpuscles. Plasma is the pale coloured extracellular fluid that holds the blood cells. 55% of the body's total blood volume is plasma. It contains mostly water (up to 95% by volume), and dissolved proteins, glucose, clotting factors, electrolytes, hormones and carbon dioxide and helps in transportation. Whereas platelets, RBC and WBC do not carry minerals, other food to the body cells. Thus, option A is correct.

Multiple choice biology simple nutrients into cells blood and its components components of blood composition of blood

Which of the above statements is correct and which are false?
(1) Plasma constitutes 45% of the human blood.
(2) Albumin is a plasma protein, which helps in osmotic balance.
(3) Factors responsible for the blood clotting process are present in the blood.
(4) Plasma without clotting factors is called serum.
(5) Minerals are not generally found in blood.

  1. Only 5 is wrong and all others 1 to 4 are correct.

  2. 1 and 2 are correct and 3, 4 and 5 are wrong.

  3. 2 and 4 are correct and 1, 3 and 5 are wrong.

  4. 1 and 5 are correct and 2, 3 and 4 are wrong.

  5. 2, 3 and 4 are correct and 1 and 5 are wrong.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Plasma is the pale yellow colored component of blood that makes up for 55% of the bloods total volume. The plasma though it is made up of 95% water it contains proteins such as albumins. The anticoagulant are present in the blood itself.  Blood serum is blood plasma without the coagulant factors.

Multiple choice zoology our health harmful microorganism for humans microbes and diseases categories of diseases

The condition, varicose veins in swelling of veins, occurs due to

  1. Loss of elasticity of the muscular layer

  2. Condition of high blood pressure

  3. Condition of low blood pressure

  4. Condition of anoxia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Varicose veins are the swelling of the veins that are present under the skin. This is due to the loss of elasticity in the walls of the veins that causes them to stretch out and slows down the blood to move back to the heart. This leads to increased blood pressure and the veins underneath the skin will swell. Thus, the correct answer is option A.

Multiple choice

What are the three main types of blood vessels?

  1. Arteries, veins, and capillaries.

  2. Arteries, veins, and lymph vessels.

  3. Arteries, capillaries, and lymph vessels.

  4. Veins, capillaries, and lymph vessels.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The three main types of blood vessels are arteries, veins, and capillaries. Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries are tiny blood vessels that connect arteries and veins.