ECG

Question 1

EGC

Answer 1

Electrocardiogram:

Question 2

P wave

Answer 2

depolarisation of the atria

Question 3

QRS Complex

Answer 3

depolarisation of the ventricles

Question 4

T Wave

Answer 4

repolarisation of the ventricles back to rest

Question 5

Why is the repolarisation of the atria not seen on an ECG

Answer 5

The atria are quite small so the repolarisation of the atria occurs during the depolarisation of the ventricles (QRS)

Question 6

Arteries structure & function

Answer 6

• high pressure vessels
• thick muscular layer
• distribute blood to main organs

Question 7

Arterioles structure & function

Answer 7

• smaller than arteries

- distributes blood to organs

Question 8

capillaries structure & function

Answer 8

• lower pressure vessels
• slow blood flow to allow exchnage between blod and body cells
• pressure drops

Question 9

Continuous Capillaries

Answer 9

• tight bound
• small gaps
• e.g. skin & muscle

Question 10

Fenstrated Capillaries

Answer 10

• larger pores
• faciliated exchange
• e.g. kidneys, small intestines

Question 11

Veins structure & function

Answer 11

• low pressure vessel
• thinner walls (less muscular)
• returns blood to heart
• blood reservoir

Question 12

Venules structure & function

Answer 12

• smal veins to drain blood from capillary bed

Question 13

skeletal muscle pump and why valves are important in this process

Answer 13

skeletal muscle and contraction squeezes veins