OCR A-Level PE CV System Revision

What are the chambers at the top of the heart called?

• Atria

• Ventricles

• Arteries

• Valves

Reorder the following

• Bundle of His

• SA Node

• Purkinje Fibres

• Bundle Branches

• AV Node

The .............. phase of cardiac muscle where chambers fill with blood.

Correctly Identify the following components of the heart.

Aortic Valve

& Inferior Vena Cava

Complete the following equation for Cardiac Output: CO =

Draw what HR response would look like for steady state exercise.

Match the following

• 70ml

• HR @ Max Intensity

• 70-72bpm

• Stroke Volume @ Sub Max Intensity

• 100-120ml

• Stroke Volume @ Rest

• 20-30l/min

• Heart Rate @ Rest

• 220-age

• Cardiac Output @ Max Intensity

Organise these options into the right categories

Groups:

(a) Neural Control

,

(b) Intrinsic control

,

(c) Hormonal Control

• Venous Return

• Adrenaline

• Chemoreceptors

• Temperature

• Noradenaline

• Baroreceptors

• Proprioceptors

At rest ​ (a)   to organs ​ (b)   , increasing blood flow; arterioles to ​ (c)   ​ (d)   to limit blood flow.

• Arterioles
• vasodilate
• muscles
• vasoconstrict
• Venodilate
• widen
• compress

Pocket Valves - Located within the ​ (a)   and prevent ​ (b)   of blood.

​ (c)   - the wall of each vein contains ​ (d)   which venoconstricts, helping ​ (e)   the blood back towards the heart.

• Veins
• Backflow
• Smooth Muscle
• push