Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove Ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Contraction Control

Autonomic Innervation, Hormones, Drugs

Where does the ANS innervate for the control of contraction? exerted on SA and/or AV Nodes
Which division of the ANS is normally dominant? Parasympathetic
What Neurotransmitter & receptor type does the Parasympathetic use? Acetylcholine - Cholinergic receptors
What effect does Acetylcholine have on RP? Hyperpolarize
What is the function of the Parasympathetic? REDUCES HR and Contractility
What is the significance of the Parasympathetic on the heart? HYPERPOLARIZES Cardiac RP via
Where do Sympathetic impulses come from? Thoracic Nerve Branches
Where do Parasympathetic impulses come from? Vagus Nerve
Where does the Neurotransmitter Epinephrine come from? Adrenal Glands
What are the 2 receptors that accept Epinephrine? ß-1 and ß2
What is the result of Epinephrine binding to a ß-1 receptor? DEPOLARIZATION --> INCREASE Rate/Force of Contraction
What is the result of Epinephrine binding to a ß-2 receptor? HYPERPOLARIZATION --> Vasodialation
What 3 factors influence HR? Drugs, Hormones, ANS
What are the 2 types of Drugs which effect the control of contraction? Cholenergic blockers & ß-blockers
What type of blocker is Atropine, and how does it work? Cholenergic - blocks Acetylcholine --> blocks Parasympathetic -->
How do ß-blockers work? blocks ß-1 --> cancel Noerepinephrine --> DECREASE HR/BP
What is the Neurotransmitter used by the Sympathetic NS? Norepinephrine
How does Norepinephrine effect the Heart? DEPOLARIZES Cardiac RP via ^ Na+/Ca++ Permeability
What is the function of the Sympathetic division of the ANS? INCREASES HR and Contractility
Created by: Kristel