na cardiac auto-rhythmic cell what is the mechanism involved in the change in membrane potential Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels open & Potassium channels close, Repolarization Potassium flows in & Calcium flows out Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels close & Potassium channels open, Repolarization Potassium flows out Calcium flows in Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises, 4. If channels close Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises Depolarization: P wave Repolarization: QRS Complex, Hyperpolarization: T wave

Match the phases of action potential +20 -40 -60 0.8 1.6 [ Choose ] b. [ Choose] c and d V [Choose ) Depolarization phase Repolarization phase Pacemaker potential

Cardiovascular: How does the PSNS alter a pacemaker action potential? Give the mechanism.

In a cardiac contractile cell what is the mechanism involved in the change in membrane potential? Depolarization: P wave Repolarization: QRS Complex, Hyperpolarization: T wave Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels close & Potassium channels open, Repolarization Potassium flows out & Calcium flows in Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises, 4. If channels close Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels open & Potassium channels close, Repolarization Potassium flows out & Calcium flows out

which of the following conditions at the S-A node will cause a decrease in heart rate? increased sodium permeability decreased acetylcholin levelsincreased norepinephrine levels increased potassium permeabilityincreased calcium permeability

Why, in physiological terms, does systolic blood pressure increase from rest to exercise and why would diastolic blood pressure remain relatively constant from rest to exercise? Discuss the roles of the nervous system, endocrine, and baroreceptors

Describe the conditions at the sarcolemma of cardiac muscle cells at rest.

Why does the cardiac muscle have a longer absolute refractory period compared to skeletal muscle?

What action potential of specialized heart cells know the function of each channel and the process?

in the cardiac His-purkinje system , why do more polarized cells conduct electrical signals more quickly ?