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 zoology frog circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system animal diversity - ii (phylum: chordata)

Select the correct option:

Fill up the blanks in the following paragraph by selecting the correct option.
The vascular system of frog is well-developed ______ (i) type. The blood vascular system involves heart, blood vessels and blood. Heart has 3 chambers, two atria and one ventricle and is covered by a membrane called ______ (ii). A triangular structure called ______ (iii) joins the right attrium.

  1. (i)- open; (ii)- conus arteriosus; (iii)- neurilemma

  2. (i)- closed; (ii)- sinus venosus; (iii)- pericardium

  3. (i)- open; (ii)- neurilemma; (iii)- conus arteriosus

  4. (i)- closed ; (ii)- pericardium; (iii)- sinus venosus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The vascular system of frog is well-developed (i) 'closed' type. The blood vascular system involves the heart, blood vessels and blood. The heart has 3 chambers, two atria and one ventricle and is covered by a membrane called (ii) 'pericardium'. A triangular structure called (iii) 'sinus venosus' joins the right atrium.

So, the correct answer is '(i)- closed ; (ii)- pericardium; (iii)- sinus venosus'.

Multiple choice bio-chemistry blood circulatory system of human role of blood in transport function of blood body fluid

Heart is a ................ pumping organ. 

  1. Blood

  2. Lymph

  3. Plasma

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

In the body, the heart is muscular organ made up of cardiac muscles which has four chambers. The right side of the heart receives deoxygenated blood from the veins and pumps it to the lungs that oxygenates it.The left side of the heart receives oxygenated blood from the lungs and pumps it through the arteries to all body. Thus the correct answer is option A.

Multiple choice zoology animal diversity - ii (phylum: chordata) vertebrates characteristics of vertebrates classification of organisms

Find the incorrect statement.

  1. Lymphatic system is present in vertebrates and lymph is finally carried to the veins

  2. All vertebrates have a single heart, enclosed in pericardium

  3. Heart of fish receives only venous blood which is pumped into lungs for oxygenation

  4. Reptilian heart is arteriovenous heart that shows incomplete double circulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement A is correct, but the question asks for the incorrect statement. Statement B is incorrect because while most vertebrates have a heart, the number of chambers varies significantly (e.g., fish have two, amphibians three, birds/mammals four), and the term single heart is misleading in the context of evolutionary complexity.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Heart of the prawn carries

  1. Oxygenated blood

  2. Deoxygenated blood

  3. Mixed blood

  4. No blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood vascular system of prawn is 'open type'. It lacks capillaries and veins. The heart pumps pure blood in arteries, which divide and redivide  into very small branches of arteries and open freely in haemocoel. The blood flows through these sinuses or blood lacunae into the entire body. All blood sinuses open into a pair of long but indistinct ventral sinus. Afferent branchial channels carry impure blood from ventral sinuses to gills, where it is purified (oxygen dissolved in water inside gills is taken in blood by diffusion and carbon dioxide present in blood is diffused out in water). The pure blood from each side of gills is conveyed to pericardial sinus by efferent branchial channels and is then returned to the heart. Thus, the heart always contains oxygenated blood, though the arteries contain mixed blood.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Heart of fish receive

  1. Oxygenated blood

  2. Deoxygenated blood

  3. Both A and B

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

Fishes have a 2-chambered heart, with an atrium and a ventricle. In fishes, the heart pumps out deoxygenated blood, which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart. It is called as single circulation.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Right atrium of rabbit receives

  1. Two anterior vena cava

  2. Two posterior vena cava

  3. One anterior and one posterior vena cava

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

Right atrium of the mammalian heart receives deoxygenated blood from anterior (superior) vena cava and posterior (inferior) vena cava. Thus, the right atrium has only deoxygenated blood. After systole, the deoxygenated blood from the right atrium goes to the lung for purification.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Heart of fishes is

  1. Two chambered

  2. Venous heart

  3. Both of the above

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

All vertebrates possess a muscular chambered heart. Fishes have a 2-chambered heart with an atrium and a ventricle. 

In fishes, the heart pumps out deoxygenated blood, which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart (single circulation). Because the heart pumps deoxygenated blood in fishes, it is called as a venous heart.

Multiple choice evolutionary changes in heart transportation - the circulatory system

In rabbit, oxygenated blood flows from

  1. Left auricle to left ventricle during auricular systole

  2. Right auricle to right ventricle during ventricular systole

  3. Right ventricle to aorta during ventricular systole

  4. Pulmonary vein to left auricle during auricular systole
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The left part of the mammalian heart contains only oxygenated blood. During auricular diastole, the oxygenated blood from the lungs come into left auricle. During auricular systole, the oxygenated blood comes into left ventricle.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Why four-chambered heart is beneficial?

  1. It increases blood pressure.

  2. It pumps blood to the lungs more often, so blood is better oxygenated.

  3. It separates oxygenated and deoxygenated blood.

  4. It lowers blood pressure and the threat of heart attacks.

  5. It supplies the brain with more blood for cognition.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the case of four-chambered heart, there are two atria and two ventricles. The type of blood circulation in such type of heart is called as double circulation, including pulmonary and systemic circulation. The blood enters twice through the heart in this cycle, which prevents the deoxygenated and the oxygenated blood from getting mixed and the circulation is maintained properly. 

Thus, the correct answer is option 'It separates oxygenated and deoxygenated blood'.

Multiple choice evolutionary changes in heart transportation - the circulatory system

The last structure to be reached by a tracer substance injected into a patient's superior vena cava before leaving heart is

  1. Right ventricle

  2. Left ventricle

  3. Pulmonary veins

  4. Left atrium

  5. Right atrium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pathway of the blood in the heart occurs in the following manner:

Vena Cava
Right Atrium
Right Ventricle
Pulmonary artery
Lungs
Pulmonary Vein
Left Atrium
Left Ventricle
Aorta
Body organs.
So, The blood actually leaves the heart after the left ventricle. If any tracers substance is injected into a patient's superior vena cava, it shall visit all the chambers and the last chamber to be visited before it finally leaves the heart will be left ventricle.
Hence, the correct answer is 'Left Ventricle'.

Multiple choice evolutionary changes in heart transportation - the circulatory system

In humans, blood vascular system has 

  1. Double circulation

  2. Venous heart

  3. Arterial heart

  4. Arteriovenous heart
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In humans, blood vascular system has Double circulation it means we have two loops in our body in which blood circulates. One is oxygenated blood and the other is deoxygenated blood. From the heart oxygenated blood is supplied to all over the body through systemic circulation and deoxygenated blood is sent to lungs for oxygenation through pulmonary veins.
So, the correct answer is 'Double circulation'.
Multiple choice evolutionary changes in heart transportation - the circulatory system

Both avian and mammalian hearts are four chambered. The anatomy and physiology of heart is described by

  1. Blood always enters into an atrium and then is pumped into a ventricle.

  2. Blood pressure alternates between systolic pressure and diastolic pressure.

  3. The atria provide one pump and the ventricles provide a second pump.

  4. The heart sends blood out through arteries and retrieves blood through veins.

  5. The heart pumps blood simultaneously through a pulmonary circuit and a systemic circuit.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Double circulation of blood is exhibited exclusively by mammals and aves as they have a four-chambered heart. it includes systemic and pulmonary circulation. Systemic circulation includes pumping of oxygenated blood to the whole body from heart and transport of deoxygenated blood from the body to heart for oxygenation. The pulmonary circuit includes pumping of deoxygenated blood from the heart to lung for oxygenation followed by its pumping to heart. This is how four chambered heart keeps oxygenated and deoxygenated blood separate via these two circulations. 

Therefore, the correct answer is option E.

Multiple choice zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

The Pulmonary trunk and systemic aorta of Foetus, connected by?

  1. Ligamentum arteriosum

  2. Ductus arteriosus

  3. Ductus arteriosum

  4. Chordae terdinae
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ductus arteriosus acts as a shunt between the pulmonary artery and the aorta during fetal development. In the fetus, before returning to the body, the blood is oxygenated in the placenta. Amniotic fluid fills the lungs and can not therefore be used to oxygenate the blood. Rather, the arterioles in the lungs restrict the quantity of blood flow that can pass through.

Multiple choice zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

Which of the following structure is lacking from the placenta?

  1. Arteries

  2. Veins

  3. Smooth muscles

  4. Nerves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The placenta is an organ, that connects the fetus to the uterine wall. This allows the nutrient uptake, waste elimination and gas exchange via the mother's blood supply, fights against internal infection and produces hormones to support pregnancy. Placenta connects the fetus by an umbilical cord which contains two umbilical arteries and one umbilical vein. The placenta is encircled by a ring of smooth muscle cells.
The placenta does not have nerves.
Thus, the correct answer is option (D), 'Nerves'.