Circulatory System SAQs

Questions and Answers

What is one primary advantage of a closed circulatory system?

It allows for maximum oxygen intake in the lungs.

It minimizes the risk of blood clotting.

It helps in the absorption of nutrients in the intestines.

It facilitates faster blood circulation. (correct)

Which of the following is NOT a function of blood?

Aid in digestion of food. (correct)

Transport nutrients to tissues.

Provide immunity against infections.

Regulate body temperature.

Which characteristic distinguishes arteries from veins?

Arteries have valves while veins do not.

Arteries contain lower pressure than veins.

Arteries carry both oxygenated and deoxygenated blood.

Arteries have thicker walls than veins. (correct)

What is the primary role of the pericardium?

To surround and protect the heart. Signup and view all the answers

Which of the following statements about the hepatic portal vein is correct?

It is an exception to the general flow of blood. Signup and view all the answers

What effect does smoking have on the cardiovascular system?

It raises blood pressure and heart rate. Signup and view all the answers

What does a person's pulse signify?

The rhythmic expansion and contraction of arteries. Signup and view all the answers

Which statement correctly differentiates systole from diastole?

Systole is marked by contracted heart chambers. Signup and view all the answers

What is an outcome of a double circulatory system?

It maintains a high enough pressure to supply the whole body. Signup and view all the answers

What effect does a poor diet have on heart health?

It can promote blockage in blood vessels. Signup and view all the answers

Study Notes

Advantages of a Closed Circulatory System

Faster blood pumping allows for efficient nutrient and oxygen delivery.
Blood flow can be regulated to specific organs, enhancing responsiveness to body needs.

Differences Between Arteries and Veins

Arteries transport blood away from the heart while veins return blood to the heart.
Blood pressure is high in arteries and low in veins; arteries have thick walls, and veins have thinner walls.
Arteries possess small lumens which facilitate high pressure, whereas veins have larger lumens.
Blood flow in arteries is pulsatile, while it is smooth in veins; valves are present in veins to prevent backflow.

Function of Valves

Valves in veins and the heart prevent the backward flow of blood, ensuring unidirectional flow.

Advantages of a Double Circulatory System

Maintains separation of oxygenated and deoxygenated blood, optimizing oxygen delivery.
Supports higher blood pressure necessary for distribution throughout the body.

Exception to General Blood Flow

The hepatic portal vein carries blood from the digestive organs to the liver instead of directly to the heart.

Functions of Blood

Transports oxygen, nutrients, hormones, and waste products.
Maintains homeostasis by regulating temperature and pH.
Provides immunity against pathogens.

Protective Structure of the Heart

The heart is encased in the pericardium, a tough protective sac that reduces friction during heartbeats.

Systole vs. Diastole

Systole refers to the contraction phase of the heart chambers, pushing blood out.
Diastole is the relaxation phase, allowing chambers to fill with blood.

Understanding Pulse

Pulse is the rhythmic expansion and contraction of arterial walls in response to blood flow.

Effects of Smoking on the Heart

Smoking elevates blood pressure and heart rate and decreases oxygen transport in the blood.

Impact of Diet on Heart Health

Unhealthy diets can lead to blocked blood vessels; excessive salt can contribute to high blood pressure and increased heart rate.

Description

Test your knowledge of the circulatory system with this quiz! Answer questions about the advantages of a closed circulatory system and the differences between arteries and veins. Ideal for students looking to reinforce their understanding of cardiovascular biology.