All of the following are correct except, ---------------------. Sinoatrial node is the dominant pacemaker of mammalian heart AV node is the latent pacemaker of mammalian heart Amplitude, duration and configuration of cardiac action potentials differ at various sites across the heart All of the above are correct Only A and B are correct

There are a number of drugs that are prescribed to patients with heart failure in an effort to increase cardiac output to improve end organ perfusion, improve blood delivery to kidneys and reduce backup of blood in the pulmonary circuit. How do the inotropic agents digitalis, levosimendan and dobutamine increase cardiac output?

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

Frank-Starling law of the heart states: if you increase the stretch of the cardiac muscle fibers you will decrease the force of contraction a greater end diastolic volume will produce a weaker contraction of the ventricle by increasing the force of ventricular contraction you will increase the end systolic volume if you increase the stretch of the cardiac muscle fibers you will increase the force of contraction.

Which of the following statements best describes the differences in the regulation of cardiac and skeletal muscle contraction?     The amount of contractile force actively generated by muscle cells is increased by stretch in skeletal muscle and decreased by stretch in cardiac muscle.     Cardiac muscle is stimulated by motor neurons and skeletal muscle by neurones from the autonomic nervous system.     Skeletal muscle contractile force is augmented by increasing the firing frequency of action potentials whereas cardiac muscle contractile force is enhanced by noradrenaline increasing calcium influx through ion channels.     Ryanodine receptors in skeletal muscle are opened by a mechanism that requires calcium influx whereas in cardiac muscle membrane depolarisation alone without calcium influx is sufficient to open ryanodine receptors.

The English physiologist William Harvey made all of the following circulatory discoveries except: the function of valves in the veins is to direct blood flow back to the heart both pulmonary and systemic blood pressure comes from pumping of the heart blood in the veins is under less pressure than is blood in the arteries arterial pressure is lowest during systole and greatest during diastole the function of the vertebrate heart is to pump blood continuously

Why is nitroglycerin given as a treatment for myocardial infarction? What does it do? Nitroglycerin is used as a treatment to improve blood flow and dilates and relaxes blood vessels and dilates them.   asap typed only

Explain the pathway of the conductions system in the Heart?don't copy from google

16. The T-wave in the electrocardiogram above is caused by:     repolarization of the ventricles, caused by K+ ions leaving ventricular muscle cells     depolarization of the ventricles, caused by Na+ ions leaving ventricular muscle cells     repolarization of the atria, caused by K+ ions leaving atrial muscle cells     depolarization of the atria, caused by Na+ ions leaving atrial muscle cells

4.4. On the circulatory system, what are the correct statements? PHYSIOLOGY_advanced  (OJO) Pacemaker cells of the heart are neurons with a stable resting membrane potential. Pacemaker cells of the sinus node, located at the left atrium, determine the heart beat frequency. Cardiac output is a function of the heart beat frequency and the stroke volume. The Frank-Starling mechanism allows coupling of the venous return with the stroke volume. Within each capillary bed there is a net loss of liquid to the extracellular space; this imbalance depends on the hydrostatic pressure and the colloid osmotic pressure gradients.