During the Cardiac Contraction cycCle, EARLY ventricular systole is characterised by

Q: Describe how the pressure in the left ventricle and in the systemic arteries varies during the…

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

Q: The second heart sound ("dub") results from vibrations generated by the A. closing of the AV valves…

A: A normal heartbeat consists of two sounds- LUB and DUB. These sounds often occur as pairs in a…

Q: Explain how an action potential occurs in cardiac contractile fibers.

A: The automatic rhythmicity of the heart is its ability to contract spontaneously and at regular rate.…

Q: The circulatory route from aorta to the venae cavae is the __________ circuit.

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

Q: What causes heart murmers in diastole and in systole

A: Diastole:It is the phase of the heartbeat when the heart muscle relaxes and allows the chambers to…

Q: Explain the events in the cardiac cycle. Describe 'double circulation'.

A: Introduction: The heart is a muscular organ in most animals, which pumps blood through the blood…

Q: The period of ventricular contraction = O phase O of pacemaker action potential O phase 2 of…

A: Isovolumetric contractions occurs in The early  stage of heart contractions. The period of…

Q: During the systolic phase of the cardiac cycle, the heart is ________. a. contracting b. relaxing c.…

A: The heart is a pumping organ that provisions or supplies all tissues and organs of the body with…

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: Describe the causes of the P, QRS, and T waves of an ECG, and indicate at which point in the cardiac…

A: The cardiac cycle represents the event that occurs after the ending of one heartbeat to the start of…

Q: The elastic properties of the arteries are essential for blood flow. Explain the importance of this…

A: Arteries and the blood are the components of the circulatory system of an organism. Circulatory…

Q: The cardiac cycle consists of a distinct relaxation andcontraction phase. Which term is typically…

A: The cardiac cycle is the process of contraction and relaxation of the heart. The primary function of…

Q: Hypertension is when the pressure of the blood against the walls of the arteries is too high.…

A: Answer:  HYPERTENSION = This is the increase in the pressure of blood throughout the body blood…

Q: Clusters of neurons in the medulla oblongata thatregulate blood pressure are known collectively…

A: The baroreceptors also called specialized stretch receptors are present within heart thin areas and…

Q: Prominent effect of the cardiovascular system in patient with hypercortisolism is:A. HypertensionB.…

A: Hypercortisolism is a rare endocrine disorder caused due to chronic exposure of body tissues to high…

Q: Define the terms contractility, preload, and afterload, and explain how these factors affect the…

A: Ans: Cardiac output: The heats efficiency is calculated by the volume of blood it pumps to the…

Q: Describe the events that occur during one cardiac cycle.

A: The cardiac cycle is a process that occurs in the heart. The process refers to the event that takes…

Q: The cells of the myocardium behave as a single, coordinated unit called a Select one: О а. cardiac…

A: Cardiovascular system plays a vital role in the transport/supply of nutrients, gases and removal of…

Q: Although not considered the primary pacemaker of the heart, the atrioventricular node can indeed be…

A: Human Heart is a four-chambered, fibro-muscular organ. There are two atria through which the heart…

Q: In the initial stages of ventricular fibrillation (during which the heart produces no functional…

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

Q: Blood in the heart chambers is separated from the myocardium by a thin membrane called the _____.

A: The correct answer is Endocardium .

Q: . In a normal individual, heart rate can be determined by the in an ECG.

A: ECG stands for Electrocardiogram.  It is a test which measures the electrical activity of heart.…

Q: Number of double circulations completed by the human heart per minute under resting conditions is

A: Components of closed circulatory system It consists of heart to pump the blood, blood vessels like’s…

Q: Concerning ventricular filling, choose the CORRECT statement? O a. Begins during isovolumic…

A: 1)The left ventricle takes blood from the left atrium during diastole, which is then discharged into…

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: The cardiac cycle includes all the events associated with the flow of blood through the heart during…

A: Heart- a organ in most of the  animals that pumps blood through the blood vessels of the…

Q: If a person’s heart rate is 72 beats per minute, determine the number of QRS complexes that would…

A: ECG stands for electrocardiogram. It is a technique in which the cardiac action potentials of the…

Q: ESV represents the minimum ventricular volume.

A: Heart is a soft-tissue organ comprises of four chambers, two auricles on the top and two ventricles…

Q: The electrocardiogram (EKG) is a tracing of the electrical events in the myocardium cardiac output…

A: Electrocardiogram is a very popular technique, used in medical biology, to determine the problems…

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: Explain how the blood volume in the left ventricle changes throughout the cardiac cycle in response…

A: Answer:  CARDIOVASCULAR SYSTEM : In all multicellular organisms there is a system which transports…

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: A 60 year-old patient HA, who was bedridden for a few days, feels dizzy and experiences significant…

A: In the given question standing up from lying position in the bedridden geriatric patient results in…

Q: Assuming that the cardiac cycle begins at the end of diastole put the following ventricular phases…

A: The correct order of  occurance of Ventricular phase is:- 1)Isovolumetric contraction phase…

Q: Fill in the blank:  During ventricular contraction, the A-V valves (tricuspid and bicuspid valves)…

A: Cardiac cycle is the event that is initiated by spontaneous generation of an action potential in the…

Q: During what phase does blood flow from the ventricles into the pulmonary trunk and aorta?…

A: The recurring sequence of changes that takes place in each beat of the heart ( cardio dynamic events…

Q: Pacemaker cells are concentrated primarily in two specific regions of the myocardium. ventricle…

A: Heart is a muscular pumping structure and is vital part of circulatory system which helps in sending…

Q: The period of ventricular filling - O phase 1 of pacemaker action potential O phase 3 of contractile…

A: Heart remains in systole for about 0.3 seconds and diastole for 0.5 seconds. The diastole is a…

Q: The volume of blood in the ventricle at the end of a systole or ejection period is known as

A: The cardiac cycle is the time period that begins with atrioventricular contraction and concludes…

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: In an ECG, the wave representing atrial repolarization = P wave PR interval O QRS complex O T wave

A: An electrocardiogram is a diagnostic procedure that records the electrical signaling of the heart.…

Q: The cardiac cycle includes all the events associated with the flow of blood through the heart during…

A: The cardiac cycle is a series of electrical and mechanical occasions that get up during the levels…

Q: Which of the following term and definition pair is correctly matched? Group of answer choices…

A: The heart is a hollow muscular organ that is located behind the sternum and between the lungs. The…

Q: Role cardioregulatory centers play in regulating heart rate

A: Cardio regulatory center is a part of brain that found in the medulla oblongata. It is responsible…

Q: Place these events in the correct order as they occur in the cardiac cycle: 1. Contraction of the…

A: Cardiac cycle Cardiac cycle is a term used to describe the relaxation and contraction that occur,…

Q: The cardiac cycle includes all the events associated with the flow of blood through the heart during…

A: INTRODUCTION The cardiac cycle is the activity of the human heart from the start of one heartbeat to…

Q: Movemen of ions into/out of cardiac cells that allow for automaticity…

A: Depolarization of cardiac cells happens due to the diffusion of Na+ ions into the sinoatrial nerve.…

Q: Following the initation of the electrical impulse in the heart, it is distributed by  a)…

A: The initiation of the electrical impulse in the heart is distributed by- c) Bundle of His

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.