RECAP FROM THE PREVIOUS LESSON. Describe how the conduction system of the heart controls the cardiac cycle. [4 marks]. Using the work you did for homework,

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Presentation transcript:

RECAP FROM THE PREVIOUS LESSON. Describe how the conduction system of the heart controls the cardiac cycle. [4 marks]. Using the work you did for homework, discuss the question in a small group.

Learning Objectives... 1)To understand how the CCC affects our heart rate. 2)To understand how exercise affects the CCC.

Heart rate regulation and control. The heart is capable of increasing or decreasing Q to meet the demand for O2 made by the working muscles. How is the heart regulated to meet these changes?

Cardiac control centre (CCC) Located in the medulla Oblongata of the brain. The CCC is primarily responsible for regulating the heart. The CCC is controlled by the autonomic nervous system (ANS).

ANS ANS means it is under involuntary control and consists of: Sympathetic nervous system = increase HR (Via accelerator nerve) Parasympathetic nervous system = decrease HR (Via vagus nerve).

How does the CCC regulate HR? Each cardiac cycle is controlled by the CCC. The CCC initiates either the sympathetic or parasympathetic nervous system to stimulate the SA node causing either….?

CCC SYMPATHETIC NERVOUS SYSTEM PARASYMPATHETIC NERVOUS SYSTEM ACCELERATOR NERVE VAGUS NERVE SA Node INCREASE HR DECREASE HR

What factors affect the activity of the CCC??????? Neural control = chemo/baroreceptors Hormonal control = adrenalin. Intrinsic control = venous return.

 Proprio-receptors in muscles, tendons and joints, inform CCC that movement has increased. Chemoreceptors located in aorta and carotid arteries detect decrease in blood pH due to increase of lactic acid and CO2. Baroreceptors detect increase in blood pressure, aorta and carotid arteries are sensitive to stretch When we start to exercise neural control starts working and…

Exam question Cardiac output is a determining factor during endurance activities. Describe how cardiac output is increased during endurance activities. [4 marks]. 1.Chemo/barorecetors detect. 2. Stimulate CCC 3. Initiates Sympathetic via accelerator. 4. Increased impulse at SA node. 5. Increased HR/SV = increased Q.