Human Circulatory System

Q. Choose the correct option which properly represents pulmonary circulation in humans.

1. Right Ventricle $\underset{\text{Blood}}{\overset{\text{Deoxygenated}}{\to }}$ Lungs $\underset{\text{Blood}}{\overset{\text{Oxygenated}}{\to }}$ Left Auricle
2. Right Ventricle $\underset{\text{Blood}}{\overset{\text{Oxygenated}}{\to }}$ Lungs $\underset{\text{Blood}}{\overset{\text{Deoxygenated}}{\to }}$ Left Auricle
3. Left Auricle $\underset{\text{Blood}}{\overset{\text{Deoxygenated}}{\to }}$ Lungs $\underset{\text{Blood}}{\overset{\text{Oxygenated}}{\to }}$ Right Ventricle
4. Left Auricle $\underset{\text{Blood}}{\overset{\text{Oxygenated}}{\to }}$ Lungs $\underset{\text{Blood}}{\overset{\text{Deoxygenated}}{\to }}$ Right Ventricle

Q. The given figure shows the schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function?

1. B - Pulmonary artery - takes blood from heart to lungs, Po2 = 90 mm Hg
2. D - Dorsal aorta -takes blood from heart to body parts, Po2 = 95 mm Hg
3. C - vena cava - takes blood from body parts to the right auricle, Pco2 = 45 mm Hg
4. A - Pulmonary vein - takes impure blood from body parts, Po2 = 60 mm Hg

Q. Choose the correct route of oxygenated blood in the body starting from its oxygenation:

1. Lungs →Pulmonary artery →Left atrium →Left ventricle →Aorta →Tissues →Vena cava→Right atrium→ Right ventricle →Pulmonary vein→Lungs
   
2. Lungs →Pulmonary vein →Left atrium →Left ventricle →Aorta →Tissues →Pulmonary artery →Right atrium→ Right ventricle →Vena cava→Lungs
   
3. Lungs →Pulmonary vein →Left atrium →Left ventricle →Aorta →Tissues →Vena cava→Right atrium→ Right ventricle →Pulmonary artery→Lungs
4. Lungs →Pulmonary artery →Left atrium →Left ventricle →Aorta →Tissues →Vena cava→Right atrium→ Right ventricle →Pulmonary artery→Tissues
   

Q. Emphysema developes mainly because of:

1. Allergy or hypersensitisation
2. Spasm of the smooth muscles of bronchioles
3. Cigarette smoking
4. Inflammation of the alveoli

Q.

Breasts in human females lie over the__________.

1. pelvic muscles
2. pectoralis muscles
3. cardiac muscles
4. none of these

Q.

What is the path of the circulatory system?

Q.

Which layer of the blood vessel is thick?

Q.

Openings of auricles into ventricles are guarded by valves.

Q. The pericardium and the pericardial fluid help in:

1. Protecting the heart from friction, shocks and keeps it moist
2. Pumping the blood
3. Receiving the blood from various parts of the body
4. None of the above

Q. Which one is present in tunica media?

1. Yellow fibres and smooth muscles
2. Squamous epithelium and striated muscles
3. Collagen fibres and smooth muscles
4. Yellow fibres and striated muscles

Q. The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

1. B – Pulmonary artery – takes blood from heart to lungs,
   $P_{O_2}$= 90 mm Hg.
2. C – Vena Cava – takes blood from body parts to right atrium,
   $P_{{\mathrm{CO}}_2}$ = 45 mm Hg
3. D – Dorsal aorta – takes blood from heart to body parts,
   $P_{O_2}$= 95 mm Hg
4. A – Pulmonary vein – takes impure blood from body parts to heart,
   $P_{O_2}$= 600 mm Hg

Q. In ECG, ST segment is elevated in-

1. Acute myocardial infarction
2. Myocardial ischemia
3. Insufficient supply of oxygen to the heart muscles
4. Both (B) & (C)

Q.

What Is pulmonary Embolism?

Q.

Which blood vessel wall layer is correctly matched with the description about its tissue structure?

1. Tunica media - consists of smooth muscle and elastic connective tissue, the amounts and proportions of each depending on vessel type

2. Tunica externa (adventitia) - consists of smooth muscle tissue

3. Tunica interna (intima) - consists of only a thin layer of connective tissue

4. Tunica media - consists of simple squamous epithelium

Q.

Coronary sulcus is found between

1. None of these

2. Atria and ventricles

3. Two atria

4. Two ventricles

Q.

How does emphysema affect gas exchange?

Q. Given below is a diagrammatic representation of a certain part of the process of circulation of blood in man. Study the same and then answer the questions that follows ​



$\left(ii\right)$ Give the number and name of the vessel which contains the maximum amount of urea a few hours after a protein rich meal.​

Q.

Match the following:

Column I	Column II
i. Fibrous pericardium	a. Decreases the friction created during beating of heart
ii. Visceral pericardium	b. Anchors the heart
iii. Pericardial fluid	c. Helps in contraction of heart
iv. Myocardium	d. Protects the cardiac muscle

1. 

2. 

3. 

4. 

Q. With the help of a well labelled diagram describe the internal structure of human heart.

Q.

How long can you live with coronary artery disease?

Q. Describe the structure of the heart of rabbit. Draw a neat, labelled diagram of L.S. of heart.

Q. The given figure shows the schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function?

1. C - vena cava - takes blood from body parts to the right auricle, Pco2 = 45 mm Hg
2. D - Dorsal aorta -takes blood from heart to body parts, Po2 = 95 mm Hg
3. A - Pulmonary vein - takes impure blood from body parts, Po2 = 60 mm Hg
4. B - Pulmonary artery - takes blood from heart to lungs, Po2 = 90 mm Hg

Q. In which vascular bed does hypoxia cause vasoconstriction?

1. Coronary
2. Pulmonary
3. Cerebral
4. Skin

Q. In which vascular bed does hypoxia cause vasoconstriction?

1. Coronary
2. Pulmonary
3. Cerebral
4. Skin

Q.

All veins carry deoxygenated blood except:

1. pulmonary vein

2. hepatic vein

3. hepatic portal vein

4. renal vein

Q. Given below are four statements (i-iv) regarding human blood circulatory system.
i. Arteries are thick-walled and have narrow lumen as compared to veins.
ii. Angina is acute chest pain when the blood circulation to the brain is reduced.
iii. Persons with blood group AB can donate blood to. any person with any blood group under ABO system.
iv. Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?

1. i and iv
2. i and ii
3. ii and iii
4. iii and iv

Q. Which option is correct with reference to statement X, Y and Z?
Statements are:
X – Wall of left Ventricle is more muscular than right ventricle
Y – Blood is transported to various body parts from left ventricle
Z – Blood is transported to lungs from right ventricle

1. X and Y correct, Z is wrong
2. X is correct, Y and Z wrong
3. X is wrong Y and Z correct
4. X, Y, Z all three are correct

Q.

Which blood vessel has the largest amount of urea?

1. Renal vein

2. Hepatic vein

3. Hepatic portal vein

4. Dorsal aorta

Q. Assertion :Spongy bones are specialized to form erythrocytes. Reason: They contain osteocytes and osteoblasts.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

Q.

Which of the following blood vessels in mammals carry highest amount of urea?

1. Hepatic vein

2. Renal vein

3. Hepatic artery

4. Hepatic portal vein