circulatory system

Question 1

aortic valve

Answer 1

• closes when the LEFT ventricle is finished contracting, allow no blood to flow into the aorta and preventing blood from flowing back into the Left ventricle.

Question 2

arteries

Answer 2

• carries blood away from the heart

* muscular and elastic than the other blood vessels, because they receive blood as it is pumped from the heart.

Question 3

blood

Answer 3

• is often called a tissue due to many kinds of cells it contains.
• 4 to 6 quarts of blood in the average human.
• blood continuously circulates throughout the body.

Question 4

capillaries

Answer 4

• connects arteriales with venules, the smallest veins.
• have thin walls, containing only one layer of cells.
• thin walls allow oxygen and nutrients to pass through to the cells and allow carbon dioxide and metabolic products from the cells to enter the capillaries.

Question 5

circulatory system

Answer 5

• known as cardiovascular system
• often referred to transportation system of the body.
• consists of the heart, blood vessels, and blood.
• transports oxygen and nutrients to the body cells, carbon dioxide and metabolic materials away from the body cells.

Question 6

diastole

Answer 6

• period of rest .

Question 7

endocardium

Answer 7

• a smooth layer of cells that lines the inside of the heart and is continuous with the inside of the blood vessels.
• allows for smooth flow of blood.

Question 8

erythrocytes

Answer 8

• red blood cells.

* the mature form circulating in the blood lacks a nucleus and is shaped like a disc with a thinner central area.

Question 9

hemoglobin

Answer 9

• a complex protein composed of the protein molecule called - globin and the iron compound called - heme .
• carries both oxygen, gives blood it’s characteristic red color.

Question 10

left atrium

Answer 10

• receives oxygenated blood from the lungs.

Question 11

left ventricle

Answer 11

• receives blood from the left atrium and pumps the blood into the aorta for transport to the body cells.

Question 12

leukocytes

Answer 12

• can pass through capillary walls and enter body tissue .

* main function is to fight infections.

Question 13

mitral valve

Answer 13

• closes when the left ventricle is contracting, allowing blood to flow into the aorta and preventing blood from flowing back into the left atrium.

Question 14

myocardium

Answer 14

• thickest layer

* the muscular middle layer.

Question 15

pericardium

Answer 15

• double - layered membrane, or sac, that covers the outside of the heart.

Question 16

plasma

Answer 16

• 90% water, with many dissolved, or suspended substance.

Question 17

pulmonary valve

Answer 17

• a blood vessel that carries blood to the lungs.
• it closes when the right ventricle has finished contracting, preventing blood from flowing back into the right ventricle.

Question 18

right atrium

Answer 18

• receives blood as it returns from the blood cells.

Question 19

right ventricle

Answer 19

• receives blood from the right atrium and pumps the blood to the lungs for oxygen.

Question 20

septum

Answer 20

• muscular wall that separates the heart into the left and right side.

Question 21

systole

Answer 21

• period of ventricular contraction

Question 22

thrombocytes

Answer 22

• important for the blood clotting process .

* usually described as fragments or pieces of cells because they lack nuclei and very in shape and size .

Question 23

tricuspid valve

Answer 23

• closes when the right ventricle contracts, allowing the blood to flow to the lungs and preventing blood from flowing back into the right atrium.

Question 24

viens

Answer 24

• blood vessels that carry blood back to the heart.