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These cells carry oxygen using hemoglobin.
Erythrocytes
Which of the following differentiates smooth muscle regulation from skeletal muscle regulation?
A) Calcium binds to tropomyosin instead of troponin.
B) Contraction is triggered by ATP binding directly to actin.
C) Phosphorylation of myosin regulates activity in smooth muscle.
D) Depolarization alone is sufficient for smooth muscle contraction.
C
A marathon runner likely has muscles rich in
Type I Fibers. They are more fatigue-resistant.
The valve that prevents backflow into the left ventricle.
Aortic semilunar valve
The QRS complex represents this major event.
Ventricular Depolarization
These specialized junctions electrically connect cardiac muscle cells.
Intercalated Discs
Which condition is characterized by low RBC count or hemoglobin?
A) Polycythemia
B) Anemia
C) Leukemia
D) Hypovolemia
Anemia
Which muscle fiber type has high mitochondria and moderate fatigue resistance?
Type IIa
Blood leaving the right ventricle passes through which valve?
Pulmonary Semilunar
Stroke volume formula
EDV – ESV
Calcium binds to this protein to expose the myosin-binding sites on actin.
Troponin
Cardiac Output (CO) equals:
A) HR + SV
B) HR ÷ SV
C) HR × SV
D) SV ÷ HR
HR x SV
The nurse explains that myoglobin is important because it:
Stores oxygen for ATP synthesis
True or False. The left side of the heart pumps deoxygenated blood.
It pumps oxygenated blood
Calcium binds to ______ in smooth muscle to start contraction.
Calmodulin
At the neuromuscular junction, the neurotransmitter released is:
Acetylcholine
The pacemaker of the heart is the:
A) AV node
B) SA node
C) Purkinje fibers
D) Bundle of His
Which fiber fatigues fastest and is best for short bursts of activity?
Type IIx
A patient with left ventricular hypertrophy primarily pumps blood to:
Aorta
True or False. The T wave represents Ventricular repolarization of the cardiac cycle.
True
Draw BOTH the Cardiac Action Potential AND the Pacemaker Action Potential, I made this one the really hard one (not really) because it may take up some time during this session,
Good student
If EDV = 130 mL and ESV = 60 mL, what is stroke volume?
A) 60 mL
B) 70 mL
C) 130 mL
D) 190 mL
70mL
Type IIx fibers rely mostly on this energy pathway.
Glycolysis
The interventricular septum’s main function is to:
Separate oxygenated and deoxygenated blood
During exercise, cardiac output increases due to:
Increased Heartrate and Stroke Volume