Cardiac System. Flashcards
Structure/Pathway of Blood. Cardiac Conduction. Nural Control. Hormonal Control.. HR x SV = Q. Cardiovascular Drift. Starling's Law.
Label the Pathway of Blood.
- Vena Cava.
- RIght Atrium.
- Tricuspid Valve.
- Right Ventricle.
- Semi Lunar Valve.
- Pulmonary Artery.
- Lungs.
- Pulmonary Vein.
- Left Atrium.
- Bicuspid Valve.
- Left Ventricle.
- Semi Lunar Valve.
- Aorta.
Label the Cardiac Conduction System.
- Sinotrial [SA] Node.
- Atrioventricular [AV] Node.
- Bundle of His.
- Bundle Branches.
- Purkinje Fibres.
Describe how the Cardiac Conduction System causes the Heart to Contract.
The CCS sends electrical signals that make the heart contract.
The signals start at the SA node travel through the Atria and reach the AV node. The signal passes through bundle branches and Purkinje Fibres which cause the ventricles to contract.
Whys is there a delay at the AV Node?
The 0.1 second delay allows the Atria to finish contracting and the blood to have moved down.
What is the role of Chemoreceptors?
Detect increased acidity levels and chemical changes caused by CO2 and removes carbon dioxide.
Where are Chemoreceptors located?
Located in the Aortic Arch and Cartoid Arteries.
What is the response to detected increases in acidity levels?
A sympathetic response.
An increase in Heart Rate.
What is the role of Proprioceptors?
Detects movements in joints and muscles and provides oxygen.
Where are Proprioceptors located?
Located in Muscles and Joints.
What is the response to detected movement?
A sympathetic response.
An increase in Heart Rate.
What is the role of Baroreceptors?
They detect increases in blood pressure.
Where are Baroreceptors located?
Located in the Aortic Arch and Cartoid Arteries.
What is the response to detected increases in blood pressure?
A parasympathetic response.
A decrease in Heart Rate.
Define Sympathetic Response.
Increase.
Define Parasympathetic Response.
Slow it down.
Decrease.
Are neural responses proportional?
Yes.
What is the response to Exercise Intensity?
The more CO2, movement, and blood [pressure that is detected, the greater the response will be.
Where is Adrenaline released from?
The sympathetic nerves and the Adrenal gland.
Where is the Adrenal Gland?
Located at the top of the kidney.
Define Antisipatory Rise.
Before the start of exercise your heart rate will rise sligtly.
Your body ‘knows’ it is about to exercise, so it releases adrenaline.
Define Myogenic.
The ability to generate it’s own electrical impulse.
Define Systole.
The heart contracts.
Define Diastole.
The heart relaxes.
Explain Starling’s Law.
Starling’s Law describes the between the volume of blood that fills the heart during diastole, the greater the force of contraction during systole.
This allows the heart to adapt to changes in blood volume and pump out an appropriate amount of blood to meet the body’s needs.