Section A Paper 1 (cardiovascular system)

What hormone causes the anticipatory rise?

What node sends out the first impulse which causes atrial systole?

• SA

• AV

Which has a higher affinity towards oxygen?

• haemoglobin

• myoglobin

which is NOT a venous return mechanism?

• valves

• respiratory pump

• thin layer of smooth muscle in the walls of the arteries

• skeletal muscle pump

Which nerve speeds up HR?

• Cardiac acceleratory

• vagus

Which is the GOOD type of cholesterol?

• LDL

• HDL

A trained athletes stroke volume during exercise and at rest will be ................. than an untrained person

• higher

• lower

• the same

During exercise the Bohr shift occurs which increases oxygen delivery to the muscles- the curve shifts to the ...

• right

• left

During exercise, the arterio-venous oxygen difference will _____

Increased venous return→

greater diastolic filling →

cardiac fibres stretched more

→ejection fraction increases→

stroke volume increases is an explanation of what law?