Blood Vessles

Question 1

there are 5 major types of blood vessles?

Answer 1

• Arteries
• Arterioles
• Capillaries
• Venules
• Veins

Question 2

what are arterial walls like?

Answer 2

Arterial walls contain elastic fibres and thick layers of smooth muscle that respond to changing pressure

Question 3

what are vein walls like?

Answer 3

The vein walls are thinner and less elastic; valves within the lumen prevent back flow.

Question 4

what are the 3 layers that make up the arterial walls?

Answer 4

• tunica externa
• tunica media
• tunica intima
• These layers contain elastic fibres and smooth muscle that respond to changing pressure.

Question 5

what are the 3 layers that make up the vein walls?

Answer 5

• tunica externa
• tunica media
• tunica intima
• the layers are thinner and less elastic than those of arteries.
• they also have valves within the lumen prevent back flow.

Question 6

what is the tunica intima composed of

Answer 6

composed of simple squamous epithelium called endothelium, a basement membrane, and an internal elastic lamina - lines the lumen, minimises friction as blood passes

Question 7

what do capillaries do

Answer 7

Waste exchange between blood and tissue occurs in capillaries throughout the body.

Question 8

what is blood pressure?

Answer 8

blood pressure is the amoount of the fource put on blood vessels

Question 9

how does blood preasure happen

Answer 9

• It is caused by the blood flow generated by the heart as it pumps, and the resistance that blood encounters as it moves through the enclosed vessel.
• When the heart contracts, blood is pushed out into the arteries.
• This force pushes against the vessel wall, making blood flow faster under high pressure.
• When the ventricles relax, the vessel’s walls push back and blood flow slows down in resulting in lower pressure.
• The contestant pumping of the heart maintains blood pressure and supply throughout the body.

Question 10

The point of highest pressure, when the ventricles is highest in the arteries, is called…

Answer 10

• systolic pressure.

Question 11

The point of the lowest pressure, when the ventricles are relaxed and the semilunar valves are closed, is called…

Answer 11

• diastolic pressure.

Question 12

The average systolic pressure how many millimetres of mercury.

Answer 12

The average systolic pressure is 120 millimetres of mercury.

Question 13

The average diastolic pressure how many millimetres of mercury.

Answer 13

The average diastolic pressure is 70 to 80 millimetres of mercury.