8 Questions
What happens at the end of ventricular isovolumic relaxation?
The aortic valve opens
Which event is associated with the first heart sound?
Closing of the aortic valve
In which phase of the ventricular muscle action potential is the sodium permeability the highest?
0
Sympathetic stimulation of the heart does which of the following?
Releases norepinephrine at the sympathetic endings
Franck-Starling's law of the heart
Explains the increase in cardiac output with increased venous return
When the cell is in absolute refractory period, its excitability
Is equal to zero
Which component mainly contributes to the colloid osmotic pressure?
Protein
What function do vitamin B12 and folic acid perform that is critical to hematopoiesis?
Support terminal differentiation of erythroid and myeloid cells
Study Notes
Heart Physiology
Ventricular Isovolumic Relaxation
- At the end of ventricular isovolumic relaxation, the aortic valve opens.
Heart Sounds
- The first heart sound is associated with the closing of the aortic valve.
Ventricular Muscle Action Potential
- In phase 0 of the ventricular muscle action potential, the sodium permeability is the highest.
Sympathetic Stimulation
- Sympathetic stimulation of the heart releases norepinephrine at the sympathetic endings.
Franck-Starling's Law of the Heart
- Franck-Starling's law of the heart explains the increase in cardiac output that occurs when venous return is increased.
Refractory Period
- During the absolute refractory period, the cell's excitability is equal to zero.
Colloid Osmotic Pressure
- Protein is the main component that contributes to the colloid osmotic pressure.
Hematopoiesis
- Vitamin B12 and folic acid support the terminal differentiation of erythroid and myeloid cells, which is critical to hematopoiesis.
This quiz assesses your understanding of heart physiology, covering topics such as ventricular isovolumic relaxation, heart sounds, and ventricular muscle action potential. It's perfect for medical students, anatomy enthusiasts, and anyone interested in heart physiology.
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