KINE 433 Test 1 review Question with verified
answers
A normal resting heart rate is determined by which part of the nervous system?
Ans✓✓ -parasympathetic
cardiac muscle cells have what characteristics (3 things)? Ans✓✓ -1. linked by
intercalated disks
2. branched
3. stimulated involuntary
Acetylcholine affects the sinoatrial node by promoting what? (hyperpolarization or
hypopolarization) Ans✓✓ -hyperpolarization
during diastole, what chambers fill? Ans✓✓ -atria and ventricles
Which type of cardiac muscle fibers are similar to skeletal muscle fibers? Ans✓✓
-type I
the t-wave on the ECG corresponds to what event in the heart? Ans✓✓ -
ventricular repolarization
during a heartbeat at rest, what is the order of activation through the specialized
conducting system of the heart? Ans✓✓ -SA node-> AV node-> (atrioventricular
bundle) ->bundle branches-> purkinje fibers
Name the mechanism that underlies preload's effects on stoke volume? Ans✓✓ -
Frank-Starling mechanism
, when neural and circulating norepinephrine lead to an increased SV, it is due to
increased what? Ans✓✓ -contractility
if blood pressure is relatively low, will it have an effect on stroke volume? Why?
Ans✓✓ -Yes, because the left ventricle will pump against less resistance
What is the formula for cardiac output? Ans✓✓ -CO = HR x SV
Does a decrease with training (at any submaximal exercise intensity) help increase
cardiac output? Ans✓✓ -No
Stroke volume starts to plateau about what percent of VO2max? Ans✓✓ -40-
60%
the answer on the exam is 50%
Accumulation of what metabolic by-products in muscle leads to vasodilation?
Hint: there are 4 things Ans✓✓ -H+, CO2, Adenosine, Heat
rate-pressure product (sometimes called double-product) is an index of metabolism
of the what? Ans✓✓ -myocardial
the fick equation/ relationship tells you that VO2 is equal to (write the formula)
Ans✓✓ -[HR* SV] *(A-V)O2 difference
answers
A normal resting heart rate is determined by which part of the nervous system?
Ans✓✓ -parasympathetic
cardiac muscle cells have what characteristics (3 things)? Ans✓✓ -1. linked by
intercalated disks
2. branched
3. stimulated involuntary
Acetylcholine affects the sinoatrial node by promoting what? (hyperpolarization or
hypopolarization) Ans✓✓ -hyperpolarization
during diastole, what chambers fill? Ans✓✓ -atria and ventricles
Which type of cardiac muscle fibers are similar to skeletal muscle fibers? Ans✓✓
-type I
the t-wave on the ECG corresponds to what event in the heart? Ans✓✓ -
ventricular repolarization
during a heartbeat at rest, what is the order of activation through the specialized
conducting system of the heart? Ans✓✓ -SA node-> AV node-> (atrioventricular
bundle) ->bundle branches-> purkinje fibers
Name the mechanism that underlies preload's effects on stoke volume? Ans✓✓ -
Frank-Starling mechanism
, when neural and circulating norepinephrine lead to an increased SV, it is due to
increased what? Ans✓✓ -contractility
if blood pressure is relatively low, will it have an effect on stroke volume? Why?
Ans✓✓ -Yes, because the left ventricle will pump against less resistance
What is the formula for cardiac output? Ans✓✓ -CO = HR x SV
Does a decrease with training (at any submaximal exercise intensity) help increase
cardiac output? Ans✓✓ -No
Stroke volume starts to plateau about what percent of VO2max? Ans✓✓ -40-
60%
the answer on the exam is 50%
Accumulation of what metabolic by-products in muscle leads to vasodilation?
Hint: there are 4 things Ans✓✓ -H+, CO2, Adenosine, Heat
rate-pressure product (sometimes called double-product) is an index of metabolism
of the what? Ans✓✓ -myocardial
the fick equation/ relationship tells you that VO2 is equal to (write the formula)
Ans✓✓ -[HR* SV] *(A-V)O2 difference
