ZOOL 2200: Quiz 8

Réussis tes devoirs et examens dès maintenant avec Quizwiz!

Match each number on the figure below of an authorhythmic cell's action potential with what is occuring.

1.) Potassium channels slowly close and t-type calcium channels open 2.) L-type calcium channels open 3.) Voltage gated potassium channels open

Match the following parts of an ECG with their proper description.

P wave: atrial depolarization QRS complex: ventricular depolarization and atrial repolarization T wave: ventricular repolarization PQ segment: AV nodal delay QT segment: ventricular systole TQ interval: ventricular diastole

The wall of the left ventricle is much thicker than the wall of the right ventricle because:

the left ventricle pumps blood to the systemic circuit which is a high pressure circuit.

The cardiac contractile cells' action potentials have a plateau phase caused by:

the opening of calcium channels.

Which of the following is true of parasympathetic activity to the SA node?

T-Type calcium channel opening is decreased.

Match each phase of the cardiac with what is occuring.

Ventricular filling: AV valves are open and semilunar valves are closed Isovolumetric ventricular contraction: AV and semilunar valves are closed and the ventricles are in systole Ventricular ejection: semilunar valves are open and AV vales are closed Isovolumetric ventricular relaxation: AV and semilunar valves are closed and the ventricles are in diastole

Cardiac muscle differs from skeletal muscle in:

all of the above are found only in cardiac muscle.

The opening and closing of the atrioventricular valves are due to:

differences in pressure across the valves.

Stroke volume or the amount of blood pumped out of the ventricles per heart beat =

end diastolic volume - end systolic volume

Which of the following would DECREASE cardiac output?

increasing parasympathetic activity to the SA node.


Ensembles d'études connexes

ECON 224- Chapter 11 Public Goods and Common Resources

View Set

Chapter 12: Helping, Social Psych: Chapter 12 (Prosocial Behavior), Social Psych Final Chap 11, Social Psych Exam #2 Ch.11, Social Psychology Exam 4, Social Psych Exam 4 SCCC

View Set

[UNIT 2] Negligence: Duty of Care and Breach of Duty

View Set

8 - Performance and outcome goals

View Set