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LESSON 17

AS PE ANATOMY &PHYSIOLOGY

James Barraclough

Cardiac Dynamics

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starter

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Homework: to be handed in & marked!!!

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Aims: Cardiac Dynamics

Objectives:

ALL learners will be able to Cardiac dynamics: Stroke volume

Heart rate

Cardiac output

During exercise The pulse

The trained heart

MOST learners will be able

SOME learners will be able to

HAND IN HOMEWORK

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Cardiac Dynamics

Heart performance dependent on 2 variables:

1. STROKE VOLUME (SV)2. HEART RATE (HR)

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ACTIVITY 1 STROKE VOLUME

1. Give a definition of stroke volume

2. It refers to blood usually ejected from where?

3. How is it measured?

4. What is the average resting volume

5. What determine stroke volume? (3 things)1.

2.

3.

30MINUTES

FEEDBACK TO CLASS

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ACTIVITY 1 ANSWERS

1. Amount of blood pumped out of heart in 1 beat

2. Usually refers to blood ejected from LV

3. Measured in Millilitres (ml) or cm

4. Average resting volume = c.75ml

5. Determined by:1. Venous return: volume of blood returning to R atrium

2. Elasticity of cardiac fibres: amount of stretch in cardiac tissuejust before contraction

3. Contractility of cardiac tissue: more contractility = greater force

of contraction

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ACTIVITY 2 HEART RATE & CARDIAC

OUTPUT1. What does HR represent (give a definition)?

2. What is the average HR of an adult human?

3. What happens to HR in a trained heart?

4. What is it called when you have a slower resting HR than

normal?5. What is cardiac output?

6. How do you measure it (equation)?

7. What is the average stroke volume?

8. Using this equation, calculate Cardiac Output for averageperson at rest

30 minutes

Feedback to class

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Activity 2 Answers

1. Represents complete heart cycle (no. of times LV ejects

blood into aorta) per minute

2. Average HR = 72bpm

3. Training4. Bradycardia

5. Volume of blood pumped from 1 ventricle in 1 min,

usually measured from LV

6. Equal to product of stroke volume & HR: Cardiac Output(Q) = Stroke Volume (SV) x Heart Rate (HR)

7. 75ml

8. Q = 75ml (SV) x 72bpm (HR) = 5400ml/min OR 5.4l/min

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Recap

Wordsearch

&

Mind map

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Homework

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Next Lesson...

Cardiac dynamics during exercise:

HR response

SV response

Q response The pulse

The trained heart