22. Ventricular Contractility increases in response to circulating Epinephrine. What factor is responsible for this increase in the force of the contraction?   A.the Na+ current (depol.) B.the Ca++ current which causes the plateau (trigger Ca++) C.the K+ current D.a decreased Central Venous Pressure

Q: Absent "P" waves in a junctional arrhythmia indicate: O A. Retrograde atrial deplorization occurs at…

A: In a normal sinus rhythm the electrical impulse startsin the sinoatrial node. which formulates P…

Q: Within the T-P interval of the EKG... a. The 2nd heart sound is heard b. the semilunar valves are…

A: a. The 2nd heart sound is heard

Q: Which of the following is a factor associated with hypertension? a. Decreased cardiac output b.…

A: Hypertension is a disease characterized by the increase in blood pressure above 140/ 90 mm Hg.

Q: Left ventricular output is generally the same as right ventricular output. If right ventricular…

A: On an average, 70 ml of blood is pumped every beat (stroke volume) and about 5000 ml every minute…

Q: 16. The onset of ventricular systole is characterized by the closing of the AVvalves and:   A. onset…

A: The cardiac cycle refers to the changes in the heart during the phase starting from one heartbeat to…

Q: 1. Which phase of Ventricular Filling increases the volume of blood in the ventricles the most?…

A: The heart is a pump that transports blood through a network of arteries. Its function is to send…

Q: Which of the following is true about the pacemaker potential in the heart? a. Decreased K+ efflux…

A: The pacemaker potential, also known as the prepotential, is the slow, positive increase in voltage…

Q: In the absence of compensations, the stroke volume will decrease when a. blood volume increases.…

A: The heart is a muscular pumping organ that supplies blood to the entire body. The stroke volume is…

Q: Standing for a prolonged period of time can cause ... a. Decline in venous return  b. A drop in…

A: Venous return is the flow of blood from peripheral regions to back to right atrium . Factors which…

Q: which of the following mechanisms contributes most to the deterioration of myocardial perfusion in…

A: The mechanism that contributes most to the deterioration of myocardial perfusion in patients with a…

Q: Stroke volume is thea. amount of blood pumped by the heart per minute.b. difference between…

A: End-diastolic volume refers to the quantity of blood in the left or right ventricle at the end of…

Q: 22. Define Ventricular Fibrillation. Describe what is happening electrically during VF.

A: Dysrhythmias Cardiac dysrhythmia is associated with abnormal electrical impulse conduction…

Q: the measurement of cardiac function; all of the following are true except A. Cardiac output is a…

A: The cardiac cycle is a cycle in which the atria and ventricles contract and relax alternately in…

Q: In a non-innervated heart Preload will increase:     A. Peripheral resistance.   B. Aortic…

A: NON INNERVATED HEART : non innervated heart means when heart is deficient of sympathetic and para…

Q: Select the correct one, Which of the following would not increase Cardiac Output? A. increase blood…

A: We know that, The amount of blood pumped by the ventricles in 1 minute is measured in terms of…

Q: 18.During exercise, all of the following occur EXCEPT A. increased stroke volume. B. increased…

A: Exercise is very important in daily life. It is an important physiological stimulus for myocardial…

Q: During ventricular diastole, pressure in the ventricles falls to ____ mm Hg, while the pressure…

A: Blood pressure is the pressure of circulating blood against the walls of blood vessels. Blood…

Q: During isovolumetric relaxation, the atrioventricular and semilunar valves are: a. open and…

A: Cardiac cycle explains the flow of blood in the heart during a single heartbeat. This helps to…

Q: In ventricular fibrillation, there is no pattern visible in the EKG. What does this mean in terms of…

A: Venticular fibrillation produces irregular electrical signals in the muscles of the ventricles .

Q: All of the following are correct about the isovolumetric contraction, except  ____________.…

A: Isovolumetric contraction is that phase of cardiac contraction in which there is no appreciable…

Q: 44. Left ventricular output is generally the same as right ventricular output. If right ventricular…

A: Cardiac output is the amount of the blood pumped by the heart per minute. On an average 70…

Q: In a healthy heart during exercise, cardiac output increases as heart rate increases up to about…

A: CO (Cardiac output) is the estimation of the volume of blood pumped by the ventricles in a minute.…

Q: The loss of arterial elasticity with age in particular affects... a. Max heart rate b. End…

A: Vascular ageing- When a person gets older their arteries structure changes they become less flexible…

Q: a calcium channel blocker or an antagonist drug will produce a. vasoconstriction b. increase in…

A: Introduction: Arterial blood pressure is the pressure of the column of blood present in the arterial…

Q: The immediate objective of increased venous constriction in the baroreceptor reflex is to....   a.…

A: Venous Constriction: The venous constriction caused by sympathetic activation of veins, or by…

Q: SA node is the main pacemaker of the heart. Why is the normal heart rate lower than the intrinsic…

A: The SA node if the natural pacemaker of the heart. It consists of a group of cells located in the…

Q: Ventricular cardiomyocytes under sympathetic drive during a bout of exercise...   a. Would…

A: Audiences of primary and clinical scientists are familiar with the idea that the sympathetic nervous…

Q: 7. State which of the 4 factors that affect resistance to blood flow changes the most on a minute to…

A: Blood consists of blood cells and plasma. Blood cells are made up of RBC, WBC, and platelets,…

Q: 22. Ventricular relaxation immediately follows ________. a. atrial depolarization b. ventricular…

A: We know that The cardiac cycle is illustrated as the time duration, which initiates with atrial…

Q: he opening of what channel will cause the plateau phase of an action potential of ventricular…

A: The plateau phase of the cardiac action potential is phase 2. In this phase the permeability of the…

Q: Which of the following would not increase Cardiac Output? A. increase blood epinephrine…

A: The amount of blood pumped by the ventricles in 1 minute is measured in terms of cardiac output…

Q: Which cell types are associated with spontaneous action potential generation in the absence of an…

A: In the human body, the neurons and the muscle cells have the potential of excitability, where they…

Q: d.T wave

A: Heart- It is the organ that pump blood through out the body is refers as the heart. it is fist…

Q: Which of the following is true of propagation of longitudinal electrical flow in cardiac muscle.…

A: Muscles are the integral components of the muscular system of the body that aids in the movement of…

Q: 22. Ventricular Contractility increases in response to circulating Epinephrine. What factor is…

A: As you have posted  multiple questions, only the first  3 questions i.e questions 23, 24, 25 will be…