Exam (elaborations)
Exam 3- BIO 251: Test Questions and Answers 100% Verified
- Course
- Institution
Exam 3- BIO 251: Test Questions and Answers 100% Verified
[Show more]
Content preview
Exam 3- BIO 251: Test Questions and Answers 100%Verified
Cardiac output is determined by what two variables?
A) stroke volume and ejection fraction
B) heart rate and ejection fraction
C) end-diastolic volume and end-systolic volume
D) heart rate and stroke volume
E) preload and afterload Correct Answer-D
Regulation of the heart (or any organ or tissue) by neural input, circulating hormones, or any
other factor originating from outside the organ is referred to as ________ control.
A) intrinsic
B) neurogenic
C) extrinsic
D) voluntary
E) myogenic Correct Answer-C
Which of the following structures is poorly innervated by the parasympathetic nervous
system and, therefore, an increase in parasympathetic activity has little effect on this
structure?
, Exam 3- BIO 251: Test Questions and Answers 100%
Verified
A) ventricles
B) conduction pathway
C) sinoatrial node
D) Purkinje fibers
E) atrioventricular node Correct Answer-A
The SA node is innervated by the
A) sympathetic nervous system only.
B) somatic nervous system only.
C) parasympathetic nervous system only.
D) sympathetic and parasympathetic nervous systems.
E) sympathetic, parasympathetic, and somatic nervous systems. Correct Answer-D
Which of the following is an effect of parasympathetic activity to the heart?
A) The rate of spontaneous depolarization in SA nodal cells decreases.
B) SA nodal cells are depolarized.
C) Heart rate is increased.
, Exam 3- BIO 251: Test Questions and Answers 100%
Verified
D) cAMP is activated.
E) Postganglionic neurons release acetylcholine, which binds to nicotinic cholinergic receptors
in
the SA node. Correct Answer-A
Which of the following is a FALSE statement about sympathetic activity to the SA node?
A) Norepinephrine binds to beta1 adrenergic receptors.
B) Potassium channel closing is enhanced.
C) cAMP levels in the pacemaker cells increases.
D) Funny channel opening is enhanced.
E) The rate of spontaneous depolarization is increased. Correct Answer-B
Under resting conditions, heart rate is primarily under the control of what control system?
A) the parasympathetic nervous system
B) the somatic nervous system
C) the sympathetic nervous system
D) intrinsic mechanisms
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ExamRoom. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79271 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now