Wednesday 20th November - COPY: Objective

To understand how the cardiac cycle is brought about

Starter:

On the worksheet ‘The Cardiac Cycle’ write 2 sentences in each

box using as many Biological keywords as you can - 5 mins

Now underline or highlight your keywords and add them up

Outcomes

•Describe the stages in the Cardiac Cycle (E)

•Explain how valves control the flow of blood through the heart (D)

•Explain how the pressures in the heart are related to the different stages in the cycle (C/B)

Literacy - To be able to spell correctly, use, understand and describe the words systole, diastole, atrio ventricular etc.

EXTENSION - Exam Questions

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

Using your text books write down definitions of the following 2

keywords

Systole -

Diastole -

period of ventricular contraction

period of ventricular relaxation

NOTE:  Normally diastole is longer than systole.

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

Card Sort Activity

Put the cards in the correct order

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

Cardiac Cycle - General Principles

Contraction of the myocardium generates pressure changes which result in the orderly movement of blood.

Blood flows from an area of high pressure to an area of low pressure, unless flow is blocked by a valve.

Events on the right and left sides of the heart are the same, but pressures are lower on the right.

http://www.tes.co.uk/teaching-resource/Anatomy-and-Physiology-of-the-Heart-6174005/

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

Atrial systole

The heart is full of blood and the ventricles are relaxed

Both the atria contract and blood passes down to the ventricles

The atrio-ventricular valves open due to blood pressure

70% of the blood flows passively down to the ventricles so the atria do not have to contract a great amount.

Ventricular systole

The atria relax.

The ventricle walls contract, forcing the blood out

The pressure of the blood forces the atrio-ventricular valves to shut (producing the heart sound ‘lub’)

The pressure of blood opens the semi-lunar valves.

Blood passes into the aorta and pulmonary arteries.

Diastole

The ventricles relaxPressure in the ventricles falls below

that in the arteriesBlood under high pressure in the

arteries causes the semi lunar valves to shut. This produces the second heart sound, ‘dub’.

During diastole, all the muscle in the heart relaxes.

Blood from the vena cava and pulmonary veins enter the atria.

The whole cycle starts again.

http://www.khanacademy.org/science/healthcare-and-medicine/pressure-volume-loops/v/pressure-in-the-left-heart---part-1

Cardiac cycle - Match the letter on the graph to the following events

Semi-lunar valves open

Atrio-ventricular valves open

Semi-lunar valves close

Atrio-ventricular valves close,

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

Describing the stages of the cardiac cycle

Now Complete the Cardiac Cycle worksheet again by describing each stage in each of the diagrams - using all the keywords you have learnt so far today..

Extension activities - Card sortHeart Matchmaker cards

Now underline or highlight your keywords and add them up

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

Cardiac Cycle flip-chart

Cut out the different stages in the cardiac cycle.

Arrange the stages so that they are in the correct order.

Staple the end of the pages together to create a flip book.

Use this book to help you remember the cardiac cycle and to answer practice exam questions!

I can put the stages of the cardiac cycle in the correct sequence

I can define systole and diastole

I can explain how the pressures in the heart are related to the different

stages in the cycle

I can label an electrocardiograph diagram to

show the heart valves opening and closing

Highlight where you think you are at

now

A*

A

B

C

D

E

I can explain how valves control the flow of blood

through the heart

I can label the main parts of the heart and describe the circulation of blood

flow round the body

Cardiac Cycle Progress

Ladder/5

References Glenn Toole, Susan Toole (2008). A2 Biology. Cheltenham: Nelson

You Tube clips to watchhttp://www.tes.co.uk/teaching-resource/Anatomy-and-Physiology-of-the-Heart-6174005/

http://www.khanacademy.org/science/healthcare-and-medicine/pressure-volume-loops/v/pressure-in-the-left-heart---part-1

Heart Glossary