PHYS 261 MOST ASKED QUESTIONS AND 100%
CORRECT ANSWERS
Abnormally slow conduction through the ventricles would change the
_______ in an ECG tracing.
- T wave
- PR interval
- RT interval
- P wave
- QRS complex
QRS complex
Which is the correct relationship among pressure, flow, and resistance?
- flow is inversely proportional to change in pressure and directly
proportional to resistance
- flow is directly proportional to change in pressure and inversely
proportional to resistance
- flow is inversely proportional to change in both pressure and resistance
- flow is directly proportional to change in both pressure and resistance
Flow is directly proportional to change in pressure and inversely proportional to
resistance
The function of transverse tubules is to
- ensure a supple of glycogen throughout the muscle sarcoplasm
- rapidly move action potentials to the interior of the muscle fiber
- conduct ATP molecules out of the mitochondria throughout the
sarcoplasm
- store Ca2+ ions inside the muscle fiber
rapidly move action potentials to the interior of the muscle fiber
The molecular event that occurs immediately after the power stroke is the
- release of actin from the myosin head
- release of ADP from the myosin
- hydrolysis of ATP by the myosin head
- binding of actin to the myosin
- binding of tropomyosin to the myosin
release of ADP from the myosin
During ventricular systole
- the pressure in the ventricular declines
- blood is entering the ventricles
,- the AV valves are closed
- the ventricles are relaxed
- the atria are contracting
the AV valves are closed
Most if the time, the parallel thick and thin filaments of the myofibrils are
connected by _____ that span the space between myosin and actin
molecules.
- tropomyosin molecules
- sarcomeres
- nebulin molecules
- calcium ions
- crossbridges
crossbridges
How does the process of smooth muscle contraction differ from
contraction in skeletal muscle?
- there is no active myosin ATPase producing energy for the myosin heads
- Ca2+ comes home from extracellular fluid and the SR
- myosin pulls on troponin instead of actin
- relaxation occurs when calmodulin is released from its receptors
Ca2+ comes from the extracellular fluid and the SR
Increased blood volume _______ blood pressure.
- increases
- decreases
- has no effect on
increases
Your instructor announces a pop quiz. Which would you expect?
- increased parasympathetic signaling and decreased cardiac output
- increased sympathetic signaling and increased cardiac output
- increased sympathetic signaling and decreased cardiac output
- increased parasympathetic signaling and increased cardiac output
increased sympathetic signaling and increased cardiac output
If the membranes of the cardiac muscle cells in the SA node become more
permeable to potassium ions,
- heart rate will increase
- the membrane will depolarize
- heart rate will decrease
, - intracellular concentration of calcium ion will increase
- stroke volume will increase
heart rate will decrease
In which situation would the stroke volume be the greatest?
- when the difference between the end-diastolic volume and the end-
systolic volume is small
- when venous return is increased
- when calcium channel blockers are present
- when venous return is decreased
- when the force of contraction is decreased
when venous return is increased
Cardiac Cycle
1. opening of semilunar valves
2. isovolumic contraction
3. beginning of atrial systole
4. closure of the AV valves
5. completion of ventricular filling
6. beginning of ventricular systole
7. ventricular relaxation
8. ventricular ejection
3,5,6,4,2,1,8,7
Which event results in the first heart sound?
- the atria contract
- the semilunar valves open
- the semilunar valves close
- the AV valves open
- the AV valves close
the AV valves close
For what are |f channels responsible in cardiac autorhythmic cells?
- the pacemaker potential
- action potential
- membrane repolarization
- cardiac diastole
the pacemaker potential
Compensation for decreased blood volume includes increases in
- sympathetic stimulation to blood vessels, sympathetic stimulation of the
CORRECT ANSWERS
Abnormally slow conduction through the ventricles would change the
_______ in an ECG tracing.
- T wave
- PR interval
- RT interval
- P wave
- QRS complex
QRS complex
Which is the correct relationship among pressure, flow, and resistance?
- flow is inversely proportional to change in pressure and directly
proportional to resistance
- flow is directly proportional to change in pressure and inversely
proportional to resistance
- flow is inversely proportional to change in both pressure and resistance
- flow is directly proportional to change in both pressure and resistance
Flow is directly proportional to change in pressure and inversely proportional to
resistance
The function of transverse tubules is to
- ensure a supple of glycogen throughout the muscle sarcoplasm
- rapidly move action potentials to the interior of the muscle fiber
- conduct ATP molecules out of the mitochondria throughout the
sarcoplasm
- store Ca2+ ions inside the muscle fiber
rapidly move action potentials to the interior of the muscle fiber
The molecular event that occurs immediately after the power stroke is the
- release of actin from the myosin head
- release of ADP from the myosin
- hydrolysis of ATP by the myosin head
- binding of actin to the myosin
- binding of tropomyosin to the myosin
release of ADP from the myosin
During ventricular systole
- the pressure in the ventricular declines
- blood is entering the ventricles
,- the AV valves are closed
- the ventricles are relaxed
- the atria are contracting
the AV valves are closed
Most if the time, the parallel thick and thin filaments of the myofibrils are
connected by _____ that span the space between myosin and actin
molecules.
- tropomyosin molecules
- sarcomeres
- nebulin molecules
- calcium ions
- crossbridges
crossbridges
How does the process of smooth muscle contraction differ from
contraction in skeletal muscle?
- there is no active myosin ATPase producing energy for the myosin heads
- Ca2+ comes home from extracellular fluid and the SR
- myosin pulls on troponin instead of actin
- relaxation occurs when calmodulin is released from its receptors
Ca2+ comes from the extracellular fluid and the SR
Increased blood volume _______ blood pressure.
- increases
- decreases
- has no effect on
increases
Your instructor announces a pop quiz. Which would you expect?
- increased parasympathetic signaling and decreased cardiac output
- increased sympathetic signaling and increased cardiac output
- increased sympathetic signaling and decreased cardiac output
- increased parasympathetic signaling and increased cardiac output
increased sympathetic signaling and increased cardiac output
If the membranes of the cardiac muscle cells in the SA node become more
permeable to potassium ions,
- heart rate will increase
- the membrane will depolarize
- heart rate will decrease
, - intracellular concentration of calcium ion will increase
- stroke volume will increase
heart rate will decrease
In which situation would the stroke volume be the greatest?
- when the difference between the end-diastolic volume and the end-
systolic volume is small
- when venous return is increased
- when calcium channel blockers are present
- when venous return is decreased
- when the force of contraction is decreased
when venous return is increased
Cardiac Cycle
1. opening of semilunar valves
2. isovolumic contraction
3. beginning of atrial systole
4. closure of the AV valves
5. completion of ventricular filling
6. beginning of ventricular systole
7. ventricular relaxation
8. ventricular ejection
3,5,6,4,2,1,8,7
Which event results in the first heart sound?
- the atria contract
- the semilunar valves open
- the semilunar valves close
- the AV valves open
- the AV valves close
the AV valves close
For what are |f channels responsible in cardiac autorhythmic cells?
- the pacemaker potential
- action potential
- membrane repolarization
- cardiac diastole
the pacemaker potential
Compensation for decreased blood volume includes increases in
- sympathetic stimulation to blood vessels, sympathetic stimulation of the
