Describe the function of red blood cells, white blood cells and platelets.Red blood cells are responsible for carrying oxygen. White blood cells fight bacterial infections. Plateletsform clots to close cuts.2 Use diagrams to describe how the three blood vessel types differ in their structure and function.Students’ diagrams should contain the following:Arteries: the largest blood vessel, with thick muscular walls designed to cope with high pressure. Theytravel away from the heart.Veins: similar in size to arteries but without much muscle in the walls. They carry blood back to the heartand contain one-way valves.Capillaries: the smallest blood vessel. They connect arterioles (artery branches) and venules (veinbranches) and enable the exchange of water, oxygen and nutrients between the blood and surroundingtissues.3 Use Figure 4 to describe the path a red blood cell takes as it moves through the body from the heart.The path of the blood through the body from the heart is artery, arteriole, capillaries, venules, vein, thenback to the heart.4 Rewrite your answer to question 3, adding the names of the veins and the arteries involved.The path of the blood through the body from the heart (with the names of the arteries and veins) isaorta artery, arteriole, capillaries, venules, vein, vena cava, heart.5 Identify the body system that supplies the nutrients that the circulatory system moves around thebody.Digestive systemApply and analyse6 Instead of the blood travelling directly from the lungs to the rest of the body, the blood returns to theheart first. Explain one advantage of the blood returning to the heart before moving around the body.The blood returns to the heart first instead of travelling directly from the lungs to the body because theblood now contains oxygen and the heart muscle itself needs oxygen so that it can keep pumping.

The function of red blood cells, white blood cells, and platelets:

Red blood cells are primarily responsible for carrying oxygen throughout the body. They do this by binding oxygen molecules to a protein called hemoglobin.

White blood cells are the body's primary defense against infections. They do this by identifying and destroying pathogens such as bacteria and viruses.

Platelets are responsible for blood clotting. When a blood vessel is damaged, platelets gather at the site and form a clot to prevent further blood loss.

The structure and function of the three types of blood vessels:

Arteries are large, muscular vessels that carry oxygenated blood away from the heart. They have thick walls to withstand the high pressure of blood being pumped by the heart.

Veins are similar in size to arteries but have thinner walls. They carry deoxygenated blood back to the heart. Veins have valves to prevent backflow of blood.

Capillaries are the smallest blood vessels. They connect arteries and veins and allow for the exchange of oxygen, nutrients, and waste materials between the blood and the body's tissues.

The path a red blood cell takes as it moves through the body from the heart:

The path of a red blood cell from the heart is through the arteries, arterioles, capillaries, venules, veins, and then back to the heart.

The path of a red blood cell from the heart with the names of the arteries and veins:

The path of a red blood cell from the heart is through the aorta (artery), arterioles, capillaries, venules, veins (vena cava), and then back to the heart.

The body system that supplies the nutrients that the circulatory system moves around the body:

The digestive system is responsible for breaking down food into nutrients that the circulatory system can distribute throughout the body.

The advantage of the blood returning to the heart before moving around the body:

The blood returns to the heart first before moving around the body to ensure that the heart itself receives a sufficient supply of oxygen. The heart muscle needs oxygen to function effectively and pump blood throughout the body.