Which of the following prevents backflow of blood in veins?
Veins have valves to prevent backflow and ensure unidirectional blood flow.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
ECG and Blood Vessels
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Which of the following blood vessels has the highest blood pressure?
The aorta has the highest blood pressure as it receives blood directly from the left ventricle.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which of the following is incorrect regarding blood circulation?
The right ventricle pumps deoxygenated blood into the pulmonary artery, not the aorta.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which blood vessels have the smallest diameter?
Capillaries have the smallest diameter, allowing exchange of gases and nutrients at the tissue level.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
What is the function of the hepatic portal system?
The hepatic portal system transports nutrient-rich blood from the intestine to the liver for metabolism and detoxification.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which of the following statements about ECG is incorrect?
The QRS complex represents ventricular depolarization, not atrial contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which part of the ECG represents ventricular depolarization?
The QRS complex represents ventricular depolarization, which triggers ventricular contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which type of blood vessel has the thickest walls?
Arteries possess thick, elastic and muscular walls to withstand the high pressure generated by ventricular contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which of the following is incorrect about systemic circulation?
The pulmonary artery belongs to the pulmonary circulation, carrying deoxygenated blood from the right ventricle to the lungs. Systemic circulation begins at the left ventricle.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which blood vessel carries deoxygenated blood from the body to the heart?
The vena cava carries deoxygenated blood from the body to the right atrium of the heart.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which of the following is correct about the hepatic portal system?
The hepatic portal system carries nutrient-rich blood from the intestine to the liver for metabolism before entering systemic circulation.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
Which of the following is correct about the hepatic portal system?
The hepatic portal system carries nutrient-rich blood from the intestine to the liver for metabolism before entering systemic circulation.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels