as pe lesson 17 2013-14
TRANSCRIPT
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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