Blood Circulation Through the Heart

P4Explain the physiology of 2 named body

systems in relation to energy metabolism in the body

Starter Music Video

Check this out ya’ll!

Activity I : Blood Circulation

• Find a diagram of the heart with the following facets to it:-– The Pulmonary Artery (Right and Left)

– Right and Left Ventricle

– Atrium

– Pulmonary Veins

– Aorta

– Vena Cava

• Now Describe the circulation (as per page 220)

Activity II: Questions

• Explain in a paragraph what the following means:-

–Double Circulation

–Pulmonary Circulation

–Systematic Circulation

The Cardiac Cycle

The chambers of the heart alternately contract and relax in a rhythmic cycle.

• During the period of contraction (systole), the heart pumps blood out through the arteries; during the period of relaxation (diastole), the heart fills with blood.

• One complete sequence of filling and pumping blood is called a cardiac cycle, or heartbeat.

Fibrillation

Electrical Activity of the Heart

• The heart's rhythm of contraction is controlled by the sinoatrial node (SA node), often called the pacemaker. This node is part of the heart's intrinsic conduction system, which is made up of specialized myocardial cells called nodal cells.

Electrical Activity of the Heart• The heart will beat without input

from the nervous system and will continue to beat, even outside the body, as long as its cells are alive.

• The automatic nature of the heartbeat is referred to as automaticity.

• Automaticity is due to the spontaneous electrical activity of the SA node. Electrical impulses generated from the SA node spread through the heart via a nodal tissue pathway that coordinates the events of the cardiac cycle

Heart Pump Operation

• The activity of the conduction system, muscles, and valves of the heart are synchronized so that the heart can operate as a pump.

• The conduction system initiates and coordinates the muscular activity of the heart.

• Pressure differentials that result from muscle activity actuate the opening and closing of valves.

• The opening and closing of valves directs the flow of blood through the heart.

Activity III : The Cardiac Cycle

• Write down the stages of the cardiac cycle in yuown words using pictures as well. Ad additional information to personalise your work.

6 StepsAs per page 221

Activity IV : Organisation

• Explain ORGANISATION (as per the diagram on the previous pages on this PowerPoint that we looked at).

As per organising the heartbeat

(page 222)Use a diagram similar to the one in the book to help you explain this...

What is heart rate?

What is and stroke volume?

Blood PressureVideo

High Blood Pressure

Activity VI : Rate/Volume/Pressure

• Write up the remaining heart components:-

– Heart Rate– Stroke Volume– Blood Pressure

• Systolic• Diastolic

• Make sure you define all the words and include examples. Also, include a piece about high blood pressure.

Plenary Activity