What are the three main parts of the circulatory system?

The heart, blood, and blood vessels.

Riddle: I am a muscular organ that pumps blood throughout the body, located in the chest. What am I?

The heart

True or False: Veins have thicker walls than arteries because they carry blood under higher pressure.

False. Veins have thinner walls compared to arteries because the blood flows with less pressure.

Fill in the blank: The ______ carries oxygen-rich blood from the heart to different parts of the body.

Arteries

Which type of blood cell helps fight infections in the body?

White blood cells (WBCs)

What is the function of platelets in the blood?

Platelets help in clotting of blood, which stops bleeding when there is an injury.

Multiple Choice: What is the primary role of the heart? A) To absorb nutrients B) To filter waste C) To pump blood D) To store oxygen

C) To pump blood

Fill in the blank: The two lower chambers of the heart are called ______.

Ventricles

Riddle: I connect arteries to veins, my walls are extremely thin and only one cell thick. What am I?

Capillaries

True or False: Blood carries waste materials away from the body.

False. Blood carries waste materials away from all parts of the body.

What is the pulse rate of an adult human at rest, typically?

72 beats per minute

Fill in the blank: The ______ system helps in the transportation of substances to and from various parts of the body.

Circulatory