Why is it important that the AV node delay the electricalimpulse moving from the SA node and the atria to theventricles?

Q: if the impulse is coming inferiorly from the SA node then how do the ventricles contract inferior to…

A: Sino atrial (SA) node is a pacemaker in the heart responsible for generation of action potential.…

Q: Compare the structure of the left atrioventricular valve with that of the aortic valve.

A: Human heart has four chambers. It is a muscular organ whose shape is like a person’s closed fist The…

Q: Why would venous valves be unnecessary in the jugular veins of the neck?

A: Veins The veins carry oxygen depleted blood from different body parts to the heart. The veins are…

Q: Why less pressure is lost overcoming resistance between the arteries and the capillaries?

A: The oxygenated blood pumped by the left ventricle have a certain amount of pressure in it which…

Q: What roles do the chordae tendineae and papillary muscles have in the normal function of the AV…

A: The heart is the muscular organs of the cardiovascular system.

Q: The finest passages through which electrical signals pass before reaching the ventricular…

A: Introduction: The muscle of heart is composed of small cells through which electrical signals are…

Q: Which of the following is most likely to be present on the resting EKG recording of a patient with…

A: AV node is among the initial areas where conduction abnormalities can be detected on an ECG. Blocks…

Q: What anatomical feature prevents the electrical signal from traveling directly from atrial muscle to…

A: The heart is a muscular organ that is divided into the left and right side to prevent the mixing of…

Q: Which structure is not functioning properly if an electrical device is needed to stimulate the atria…

A: The heart has an electrical conduction system that consists of a highly constricted and controlled…

Q: Sino-atrial node is called the pacemaker of our heart. Why?

A: The SA (sino-atrial) node is a neuron’s specialized bundle that is located in the upper part of…

Q: Why are the tendinous cords required for the proper functioning of the AV valves?

A: The heart is a muscular organ of the cardiovascular system that functions to pump the blood to the…

Q: List the three major veins that return blood from the thoraxto the superior vena cava.

A: The heart received blood from various parts of the body and carries deoxygenated blood into the…

Q: The sinoatrial node is also called the A. PacemakerB. Action potentialC. Resting membrane potent

A: Heart is an important organ that pumps blood. Heart is myogenic in nature meaning it is capable of…

Q: Explain why ventricles are more muscular than atria

A: Heart ventricles: The large, lower chembers of the fibromuscular organ(heart) that collect and expel…

Q: What is the inherent rate of automaticity at the AV junction?

A: The Heart is a vital part of the body, it supplies the blood to the various body part, organs. It is…

Q: Why is the cardiac action potential propagated more slowly in an AV node cell then in an atrial or…

A: Cardiac action potential  It refers to the short alteration in the voltage i.e. membrane potential…

Q: Why is there a pause after the atrial contraction andbefore the ventricular contraction?

A: The human heart has four chambers within it. These four chambers are the Right and Left atria and…

Q: Describe the components of the left atrioventricular valve.

A: The heart has four chambers: right atrium, right ventricle, left atrium, and left ventricle. The…

Q: Right ventricular pressure is always the same as left ventricular pressure

A: Our heart is divided into four chambers. Two ventricles and two auricles. Our heart is divided into…

Q: High pressured blood in the ventricles: O forces the AV valves open. O forces the semilunar valves…

A: The heart is the blood pumping organ of animals. It is composed of 4 chambers. The 2 upper chambers…

Q: Explain why the walls of the atria are thinner than those of the ventricles, and why the wall of the…

A: The walls of Artria are thinner than Ventricle because the artria are only receiving chambers…

Q: Which of the following structures acts to carry electrical impulse to the ventricles?…

A: The heart, in the simple words, a pump consisting of muscle tissue. Like all muscles the heart…

Q: How does the depolarization of pacemaker cells differfrom the depolarization of other cardiac cells?…

A: Anatomy and physiology are the branches of biology, anatomy deals with the study of the structure of…

Q: List the names of the atrioventricular valves

A: The prime organ of the circulatory system is the heart. It plays a vital role in pumping oxygenated…

Q: What is the stage of thecardiac cycle during which theventricles are filled?

A: The cardiac cycle is the sequence of events that occurs when the heartbeats. One cardiac cycle is…

Q: Explain why it is more efficient for contraction of the ventricles to beginat the apex of the heart…

A: To answer this question we should have knowledge of Physiology.

Q: Which portion of the ECG corresponds torepolarization of the atria?a. P waveb. QRS complexc. T…

A: The cardiac action potential refers to a brief variation in the membrane potential through the cell…

Q: The degree of stretch experienced by the sarcomeres in the ventricle cells before they contract is…

A: The simplest functional unit of striated muscle is the sarcomere. Across two Z-lines, it is the…

Q: All the blood that passes through the aorta, except the blood that flowsinto the coronary vessels,…

A: Resistance is a force that opposes the flow of a blood.

Q: Lumen of the right atrium Lumen of the right ventricle Right atrioventricular valve Right coronary…

A: * Heart is made up of cardiac muscles  * Heart consists of two atria and two ventricles  * And it…

Q: Coronary artery disease in the acute marginal branches would affect which part of the myocardium?

A:

Q: The input and exit valves to the ventricles are located in a superior position to the lumen.  What…

A: The heart is the organ that pumps the blood to the other parts of the body. The oxygenated blood…

Q: Phase C of the ventricular action potential is due to which of the following? otential (mV)

A: Ca+2 influx

Q: The first heart sound represents which portion of thecardiac cycle?a. atrial systoleb. ventricular…

A: The heart is a hollow muscular organ. It pumps the blood via circulatory system through rhythmic…

Q: List in order the major blood vessels, chambers, and valves through which a drop of blood must pass…

A: Vena cava – the large vein that returns blood to the heart from the body parts. Superior vena cava…

Q: Occasionally an ectopic pacemaker will develop in part of the conducting system of the heart. What…

A: An ectopic pacemaker is a collection of excitable cells located outside of the heart's typically…

Q: Why do ventricles have thicker walls than atria?

A: This question is based on the thickness of ventricles and atria.

Q: Which artery most commonly gives rise to the nodal artery a critical blood supply to the…

A: The circulatory framework, additionally called the cardiovascular framework or the vascular…

Q: The visceral pericardium is ..... to the parietal pericardium

A: The pericardium is the thin sac-like covering of the heart. It lubricates the heart and is required…

Q: What normally serves as the pacemaker of the entire heart? O Purkinje fiber system O…

A: Introduction: The heart has a specialized cardiac musculature known as nodal tissue (distributed in…

Q: What valve prevents the backflow of blood from the right ventricle into the right atrium? right…

A: One of the most essential systems in the human body is the circulatory system. It is made up of the…

Q: The flaps of the atrioventricular valves are kept pointed in the direction of blood flow by…

A: The circulatory system consists of three systems that work together; the heart (cardiovascular),…

Q: As blood in the ventricles surges back against the closed AV  valves, the first heart sound ("lubb")…

A: The heart is the hollow pumping organ of the body that is responsible for circulating the blood to…

Q: Which fiber system is the first to depolarize in a cardiac cycle? Group of answer choices AV node…

A: Question - Which fiber system is the first to depolarize in a cardiac cycle? Group of answer choices…

Q: Trabeculae ___ are visible on the inner surface of the ventricles

A: The human heart is four-chambered with two atria and two ventricles that help in pumping the blood…

Q: What is the key PR interval characteristic of third-degree AV block? The PR gets gradually longer…

A: Introduction:-  3rd degree heart block is complete blockage of the transmission of signals from the…

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.