MEDICAL PHYSIOLOGY PHSL 1010: EXAM 2 - QUESTIONS AND
ANSWERS | 2026 UPDATE | 100% CORRECT.
T-tubules (triads) - (answer)Depolarizing currents pass to the sarcoplasmic reticulum via:
Troponin - (answer)The muscle protein that binds to Ca++ during excitation-contraction coupling is:
One muscle cell only - (answer)A skeletal muscle fiber comprises:
Slow-twitch fibers have more myoglobin than fast-twitch AND Slow-twitch fibers are more fatigue-
resistant than fast-twitch - (answer)Fast-twitch muscle fibers differ from slow-twitch fibers in which
way(s)?
Smooth muscle cells have only one nucleus AND Smooth muscle contracts more slowly than skeletal
muscle - (answer)Smooth muscle differs from skeletal muscle in which way(s)?
Z lines (from striated [cardiac & skeletal] muscles) - (answer)Smooth muscle dense bodies perform a
similar function to:
Inside sheets of smooth muscle - (answer)Parasympathetic ganglia that aid in control of smooth muscle
contraction are located:
Ca++ enters the cell, Ca++ binds to calmodulin, myosin heads are phosphorylated, myosin binds to actin
- (answer)The correct sequence of events in smooth muscle contraction is:
Cardiac muscle cells have only one nucleus and are branched - (answer)Cardiac muscle differs from
skeletal muscle in which way(s)?
Both serve as the insertion point for cardiac muscle cells and contain numerous gap junctions and
desmosomes - (answer)Intercalated disks:
Is both limited by parasympathetic activity and is similar to that seen in skeletal muscle -
(answer)Excitation-contraction coupling in cardiac muscle:
, MEDICAL PHYSIOLOGY PHSL 1010: EXAM 2 - QUESTIONS AND
ANSWERS | 2026 UPDATE | 100% CORRECT.
Are characterized by a broad plateau as Ca++ enters the cell - (answer)Action potentials in cardiac
muscle cells:
Gap junctions - (answer)Depolarizing signals pass through the atrial musculature via:
Closure of the mitral valve AND Closure of the tricuspid valve - (answer)The first "heart sound" is made
by:
Atrial diastole - (answer)The greatest blood pressure is achieved at:
Anchor the leaflets of the A-V valves AND Are inserted into the ventricular musculature -
(answer)Papillary muscles:
Varies with heart rate (and stroke volume) - (answer)Cardiac output:
Achieves maximum force when muscle fibers are stretched AND Achieves maximum force when end
diastolic volume is greatest - (answer)The Frank-Starling Law of the Heart shows that cardiac muscle:
Can be enhanced by catecholamines - (answer)Contractility of the heart:
Arteries have more elastic fibers in the tunica media than veins - (answer)Arteries differ from veins in
which way?
Cardiac output and arterial resistance - (answer)Mean arterial pressure is directly proportional to:
Is affected by stress, emotion, epinephrine, and by sympathetic stimulation - (answer)Arterial
resistance:
ANSWERS | 2026 UPDATE | 100% CORRECT.
T-tubules (triads) - (answer)Depolarizing currents pass to the sarcoplasmic reticulum via:
Troponin - (answer)The muscle protein that binds to Ca++ during excitation-contraction coupling is:
One muscle cell only - (answer)A skeletal muscle fiber comprises:
Slow-twitch fibers have more myoglobin than fast-twitch AND Slow-twitch fibers are more fatigue-
resistant than fast-twitch - (answer)Fast-twitch muscle fibers differ from slow-twitch fibers in which
way(s)?
Smooth muscle cells have only one nucleus AND Smooth muscle contracts more slowly than skeletal
muscle - (answer)Smooth muscle differs from skeletal muscle in which way(s)?
Z lines (from striated [cardiac & skeletal] muscles) - (answer)Smooth muscle dense bodies perform a
similar function to:
Inside sheets of smooth muscle - (answer)Parasympathetic ganglia that aid in control of smooth muscle
contraction are located:
Ca++ enters the cell, Ca++ binds to calmodulin, myosin heads are phosphorylated, myosin binds to actin
- (answer)The correct sequence of events in smooth muscle contraction is:
Cardiac muscle cells have only one nucleus and are branched - (answer)Cardiac muscle differs from
skeletal muscle in which way(s)?
Both serve as the insertion point for cardiac muscle cells and contain numerous gap junctions and
desmosomes - (answer)Intercalated disks:
Is both limited by parasympathetic activity and is similar to that seen in skeletal muscle -
(answer)Excitation-contraction coupling in cardiac muscle:
, MEDICAL PHYSIOLOGY PHSL 1010: EXAM 2 - QUESTIONS AND
ANSWERS | 2026 UPDATE | 100% CORRECT.
Are characterized by a broad plateau as Ca++ enters the cell - (answer)Action potentials in cardiac
muscle cells:
Gap junctions - (answer)Depolarizing signals pass through the atrial musculature via:
Closure of the mitral valve AND Closure of the tricuspid valve - (answer)The first "heart sound" is made
by:
Atrial diastole - (answer)The greatest blood pressure is achieved at:
Anchor the leaflets of the A-V valves AND Are inserted into the ventricular musculature -
(answer)Papillary muscles:
Varies with heart rate (and stroke volume) - (answer)Cardiac output:
Achieves maximum force when muscle fibers are stretched AND Achieves maximum force when end
diastolic volume is greatest - (answer)The Frank-Starling Law of the Heart shows that cardiac muscle:
Can be enhanced by catecholamines - (answer)Contractility of the heart:
Arteries have more elastic fibers in the tunica media than veins - (answer)Arteries differ from veins in
which way?
Cardiac output and arterial resistance - (answer)Mean arterial pressure is directly proportional to:
Is affected by stress, emotion, epinephrine, and by sympathetic stimulation - (answer)Arterial
resistance:
