Biology · General Awareness

Human Circulatory System

846 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

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

  1. atrial; ventricles

  2. ventricular; arteries

  3. atrial; atria

  4. ventricular; ventricles
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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.

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

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

Systole brings about the

  1. Entry of blood into lungs

  2. Entry of blood into heart

  3. Exit of blood from lungs

  4. Exit of blood from ventricles
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Blood pressure in the veins is lower than that of arteries. The best hypothesis to explain this is that 

  1. Capillaries offer resistance to the blood flow

  2. Veins are farther from the heart

  3. Most veins carry blood up-hill

  4. Veins have thinner walls than arteries
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The arteries carry blood away from the heart, while veins return blood to the heart. With both, their structure is related to their function. Blood in the arteries is under high pressure generated by the heart. The arteries have thick outer walls and thick layers of muscle and elastic fibers. The blood in veins is under lower pressure than the blood in arteries. The veins have thin walls and thin layers of muscle and elastic fibers. Unlike arteries, veins have one-way valves in them to keep the blood moving in the correct direction.

So, the correct answer is option B.

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

Choose the correct answer from the alternatives given.
In an one-circuit circulatory system, blood pressure:

  1. cannot be determined

  2. is higher at the intestinal capillaries than at the gill capillaries

  3. drops significantly after gas exchange has taken place

  4. is constant throughout the system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In a single-circuit circulatory system as seen in fishes, the oxygenated blood from the gills does not enter the heart. The heart does not receive oxygenated blood, so known as venous heart. It is directly distributed in the entire body, after which it loses its pressure due to the absence of pushing force. Only the deoxygenated blood enters the auricle and then the ventricle. The deoxygenated blood enters the gills for oxygenation from the ventricle. Blood has a slow flow and low pressure.
So, the correct option is 'drops significantly after the gas exchange has taken place'.
Multiple choice

What is intravenous injection?

  1. It is administered under the skin

  2. It is administered intradermal

  3. It is administered via the blood vessels

  4. It is administered in the muscle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Intravenous (IV) injection involves delivering medication directly into the bloodstream via a vein, allowing for rapid systemic distribution.

Multiple choice

What is subcutaneous injection?

  1. It is administered intradermal

  2. It is administered via the blood vessels

  3. It is administered in the muscle

  4. It is administered under the skin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A subcutaneous (SQ or SC) injection is administered in the space between the skin and the muscle. This is a common route for many vaccines and medications.

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'.