What roles do the chordae tendineae and papillary muscles have in the normal function of the AV valves?

Q: During diastole: A. the AV-valves are open and the aortic & pulmonary arterial valves are closed. B.…

A: Systole and diastole are part of cardiac cycle. Systole means contraction of heart and diastole…

Q: Name the valve present in the opening of inferior cava.

A: Inferior vena cava is the largest vein in the human body that is responsible for carrying…

Q: Where is the right coronary artery located? What are its main branches, and what do they supply?

A: CORONARY ARTERY:                Coronary arteries depicts the blood vessels that surrounds and…

Q: What is the functional significance of the difference in thickness between the wall of the aorta and…

A: The aorta is the main artery which carries blood away from heart to the rest of  body.  The…

Q: What are the structural differences seen between fetal and adult circulation?

A: Fetal circulation is the circulation of blood through the cardiovascular system of human fetus. It…

Q: Where is located the primary heart pacemaker? What is its function? What is the normal heart rate…

A: The heart is the most important organ for the body and is made up of several different types of…

Q: Which vessels supply blood to the myocardium?

A: The heart of the human has four chambers. These four chambers are the Left and Right atrium, Left…

Q: What are normal heart sounds? Where are they best heard? What do these heart sounds indicate?

A: The heart sounds are the sounds auscultated during the pumping of blood through the heart.

Q: How does blood return to the heart despite the low pressure?

A: Answer: Introduction: The heart is a muscular organ present behind and partially left of the…

Q: What are atrioventricular valves ? Where they are located ?

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

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: Define the term - vena cava ?

A: Answer- Humans have closed type of circulatory system and it comprises of arteries and veins to…

Q: atrium) aorta aortic semilunar valve left ventricle left atrium lung capillaries mitral valve…

A: Introduction:- Blood leaves the heart through the pulmonic valve, into the pulmonary artery, and to…

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: What is the most important factor causing pulmonary artery constriction? What other factors are…

A: Pulmonary artery vasoconstriction is the homeostatic mechanism that occurs in the pulmonary…

Q: Why is the intrapleural pressure normally lower than intrapulmonary pressure? What is the function…

A: Intrapleural pressure is the pressure inside the pleural cavity.

Q: What is the normal range of rv5 sv1 in ECG?

A: Introduction: ECG or electrocardiogram is a machine that reads the electrical signal from your heart…

Q: What is the valve thatseparates the aorta from theheart? What is the importanceof that valve?

A: The heart is the muscular organ that involves in pumping action of blood to all parts of the tissue.…

Q: What is meant by the term venous return?

A: The flow of blood back to the heart is known as Venous return. The blood is received by the right…

Q: What is Complete AV Block? What is its role?

A: Complete Atrioventricular block is the condition when the heart beats too slowly and leads to the…

Q: Why are the left and right coronary vessels considered the major coronary vessels?

A: The coronary vessels are the blood vessels which are responsible for supplying blood to the heart.

Q: What are Korotkoff sounds? Which phases of Korotkoff sounds are recorded as systolic and diastolic…

A: The sounds which are heard (such as through a stethoscope) when measuring blood pressure (BP)…

Q: How are the two heart sounds produced during cardiac cycle? Which one of these is of longer…

A: The cycle that involves the end of one heartbeat and initiation of the second heartbeat is called…

Q: Compare the structure of the tricuspid valve with that of the pulmonary valve.

A: Answer given below..

Q: How does the blood in the pulmocutaneous arch differ from that in the higher two aortic arches?

A: The circulatory system of amphibians includes pulmocutaneous circulation. It is in charge of…

Q: What are the valves of thevenous system? What is theirfunction?

A: Blood vessels are the components of the circulatory system, which are essential for transporting…

Q: Why is atrial repolarization not observed in the ECG?

A: ECG stands for electrocardiography. It is a process to produce an electrocardiogram. To check for…

Q: What is the difference between the systole and diastole and their pressure?

A: The cardiac cycle involves events and patterns of contraction and relaxation of heart to complete…

Q: What are Absolute shunts?

A: *Absolute shunting is defined as when blood flow remains constant while ventilation steadily…

Q: Explain Sinus Rhythm with First-Degree AV Block?

A: The cardiovascular system of the human body is made up of the heart, blood, and blood vessels that…

Q: What is the normal function of the aortic and carotid sinus baroreceptors?

A: Receptors are chemical structures made up of proteins that collect and send signals that can be…

Q: What pressure changes cause the closing of the AV valves and the opening of the semilunar valves?

A: AV valve stands for atrioventricular valves, which are responsible for connecting the atrium to the…

Q: Does ECG lead placement matter?

A: Introduction: ECG (electro cardio gram) is the most important diagnostic for studying the cardiac…

Q: Where does anatomic shunt exist?

A: Introduction: The fetal circulation starts when umbilical vein carrying oxygenated blood flow…

Q: Why is it important that the AV node delay the electricalimpulse moving from the SA node and the…

A: The  AV node is a part of the electrical conduction system of the heart that coordinates the top of…

Q: What is the function of the coronary sinus?

A: Blood that has been exposed to oxygen in the lungs is said to be oxygenated blood. Blood that has a…

Q: What innervates the pericardium?

A: The heart is the organ that pumps blood everywhere. This helps in the change of oxygen and carbon…

Q: What is the significance of the difference in thickness between the wall of the aorta and the wall…

A: Introduction: The largest artery present in human body is the aorta which starts from the top of the…

Q: How is Cardiac Index?

A: Cardiac index (CI) is the amount of blood pumped from the left ventricle per minute per unit body…

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.