Question

give the correct answer..??​

Answer 1

Answer:

*white blood cells, and platelets

*Oxygenated blood flows from the lungs to the left atrium, which is on the left of the upper heart chamber. The atrium has a wall that is thin. When the left atrium softens, the blood in the left atrium is stored.

*The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.

*Their muscular walls are thicker than the atria because they have to pump blood out of the heart. ... This is because the left ventricle has to pump blood at a higher pressure so that it reaches all areas of the body (including the fingers and toes) but the right side only has to pump blood to the lungs.

*Arteries have thick, elastic, muscular walls whereas veins have thin walls with few elastic fibres. ... Veins have one-way valves whereas arteries do not have any valves. Veins need valves as the blood flowing through them is at such a low pressure that they need something to prevent it going backwards!

Answer 2

$\underline\mathtt\blue{1. \:Answer:}$

• Plasma
• Platelets

$\underline\mathtt\blue{2. \:Answer:}$

Oxygenated blood flows from the lungs to the left atrium, which is on the left of the upper heart chamber. The atrium has a wall that is thin. When the left atrium softens, the blood in the left atrium is stored.

$\underline\mathtt\blue{3.\:Answer:}$

• The valves prevent the backward flow of blood.
• These valves are actual flaps that are located on each end of the two ventricles .
• They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.

$\underline\mathtt\blue{4.\: Answer:}$

Since ventricles have to pump blood into various organs and the pressure of the blood flowing in them is more than that of it in the auricles, therefore, ventricles have thicker muscular walls than the auricles.

$\underline\mathtt\blue{5.\:Answer:}$

• Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body.
• Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.

Hope it helps ☺️..!