term1 Definition1term2 Definition2term3 Definition3
Please sign in to your Google account to access your documents:
How much does the body's total energy expenditure increase during high-intensity exercise?
15 - 25 time above expenditure at rest
What are the two major adjustment in blood flow that must occur to meet increased demands of muscle during exercise?
1. An increase in cardiac output
2. A redistribution of blood from inactive organs to the active skeletal muscle
Cardiac Output
HR X SV (Heart rate x Stroke Volume)
Regulation of heart rate is controlled intrinsically by....
SA node (Sinoatrial node), located in the posterior wall of the right atrium
Regulation of heart rate is controlled extrinsically by...
nervous and hormonal systems
What is the AV (atrioventricular) node?
A small knot of tissue located in the floor of the right atrium gives off many branches that facilitate ventricular contraction.
Describe the vagus nerves' contribution to heart rate
Vagus nerves are parasympathetic fibers that make contact with both the SA and AV nodes. Upon simulation they release acetylcholine which causes a decrease in the activity of both the SA and AV nodes, reducing heart rate.
Chronotropic response
Inotropic response
Increased force of heart contractility
Cardiac Accelerator nerves
Sympathetic fibers that innervate the SA node and ventricles
Need help typing ? See our FAQ (opens in new window)
Please sign in to create this set. We'll bring you back here when you are done.
Discard Changes Sign in
Please sign in to add to folders.
Sign in
Don't have an account? Sign Up »
You have created 2 folders. Please upgrade to Cram Premium to create hundreds of folders!