22. Ventricular relaxation immediately follows ________. a. atrial depolarization b. ventricular repolarization c. ventricular depolarization d. atrial repolarization.

Q: In a normal heartbeat the ventricles begin to contract ______.   A at exactly the same time as the…

A: The blood circulating through the circulatory system is responsible for the transport of oxygen and…

Q: Action potentials pass from one cardiac muscle cell to anothera. through gap junctions.b. by a…

A: The structures which provide adhesion and communication between cells are called intercellular…

Q: Reductions in heart rate are normally caused by _____.   A sympathetic stimulation of the…

A: Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The…

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: 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: Purkinje fibersa. are specialized cardiac muscle cells.b. conduct impulses much more slowly than…

A: A fully developed adult heart maintains the capability of generating its own electrical impulse,…

Q: When the ventricles are no longer acting as a syncytium and can't pump blood, they are in ____.…

A: The conditions where the heart of a normal person is unable to function properly is called as heart…

Q: Compared to the ventricles, the atria ____.   A do not contract as many times per minute   B…

A: It also removes waste products from the body. It has three components: blood, heart and the blood…

Q: Parasympathetic stimulation of the sinoatrial node ______.   A is necessary; without it the heart…

A: Parasympathetic system of the body is responsible for the body's rest and digestion response when…

Q: Drugs that increase the heart rate have __________a effect.a. myogenicb. negative inotropicc.…

A: Answer is e.) positive chronotropic.

Q: The vessels that carry oxygen to the myocardium are called __________.   A pulmonary arteries   B…

A: Blood is the body fluid that flows in tube-like structures known as vessels and functions in the…

Q: an increase of which of the following will increase mean artrial pressure a. venous return b.…

A: The heart's role in any organism is to keep "blood" flowing continuously throughout the body. Blood…

Q: Atrial systole follows _________.     T-wave     Z-wave     P-wave     QRS complex

A: Introduction: The sequence of alterations in the flow and pressure in the cardiac chambers and the…

Q: Moving from a SUPINE to a STANDING position result in an:  a. decrease in heart rateb. increase in…

A: The question is asking about the physiological changes that occur in the body when moving from a…

Q: Between the second sound of one beat and the first sound of the next beat the _____.   A semilunar…

A: Heart sounds are generated by blood flowing in and out of the heart’s chambers through the valves as…

Q: The patient's ECG indicates that _____.     action potentials are passing from his atria into his…

A: Electrocardiogram or ECG is the record or graphical registration of electrical activities of the…

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: ulmonary circulation differs from systemic circulation in that the______.   A blood pressure in…

A: Pulmonary circulation moves blood between the heart and the lungs. It transports deoxygenated blood…

Q: Reduction in the lumen diameter of a blood vessel as the smooth muscle contracts is known as

A: The blood vessels are highly regulative structures that relax and contract whenever required to…

Q: Ventricular relaxation immediately follows ________.a. atrial depolarizationb. ventricular…

A: The cardiac cycle is the duration of time that starts with atrial contraction and ends with…

Q: The patient's ECG indicates that _____.   A action potentials are passing from his atria into his…

A: Electrocardiography -- The process by which electrocardiogram is done defined as electrocardiography…

Q: At the time point indicated on the ECG ____.   A blood would be flowing from the ventricles into…

A: An electrocardiogram can be defined as the type of test in which the heart's electrical activity is…

Q: Prothrombin is converted to thrombin during the ________.a. intrinsic pathwayb. extrinsic pathwayc.…

A: The process initiated by an injured blood vessel to decrease the rate of blood flow and trigger the…

Q: The atrioventricular valves open because ______.   A relaxation of the ventricles causes the…

A: Atrioventricular valves These are the valves which connect the atrium to the ventricles. There are…

Q: Most blood enters the ventricle during ________.a. atrial systoleb. atrial diastolec. ventricular…

A: Each cardiac cycle comprises of a time duration starting with the contraction of atria and ending…

Q: he blood pressure in the left ventricle during systole is ______ the blood pressure in the right…

A: The blood pressure is the pressure of the blood within the arteries. It is produced primarily by the…

Q: In veins the ______ than in capillaries.   A blood pressure is higher and flow velocity is slower…

A: The Blood vessels are the part of our vascular system that is responsible for transporting blood and…

Q: Cardiac action potentials have _________ duration than neuronal action potentials. A. a shorter…

A: Introduction Unlike the action potential in skeletal muscle cells, the cardiac nerve impulse isn't…

Q: The first heart sound is heard as the ECG records the end of the ______.   A P wave   B T-P…

A: An electrocardiogram (ECG or EKG) records the electrical signal from your heart to examine for…

Q: After passing through the inferior vena cava blood passes through the ____.   A coronary sinus   B…

A: The cardiovascular system or circulatory system is comprised of blood pumping muscular organ, heart,…

Q: Let's review the electrical events that occur during a heartbeat. Match each phase of the ECG in the…

A: A. The atria depolarize ( P wave)B. The ventricles repolarize (T wave)C. (Diastolic interval; the…

Q: 17, The P-wave of the ECG is generated by the repolarization of the SA-Node.   A. trueB. false

A: The main function of the SA node is to act as the normal pacemaker of the heart. It initiates an…

Q: Repolarization of ventricular myocardiocytes is caused by ______ the cells through voltage-gated…

A: Repolarisation is caused by the movement of positively charged k+ ions out of the cell. it initially…

Q: ne symptom of right ventricular failure would be _____.   A difficulty breathing when lying in the…

A: The right ventricle moves deoxygenated blood from the heart back to the lungs to be resupplied with…

Q: Cardiac output measures blood ejected from a. both atria each minute b. each ventricle each minute…

A: Cardiac output refers to the volume of blood that is pumped by the heart per unit of time, usually…

Q: In a patient with _______ some of the oxygenated blood returning to the left atrium would be pumped…

A: The blood enters the heart's right atrium from the body, where it moves to the right ventricle and…

Q: The sinoatrial node sets the pace for the heart as a whole because sinoatrial node cells _____.   A…

A: The human heart is located in the mediastinum (It is the central place in the chest or thoracic…

Q: The function of the right and left bundle branches is to _____.   A rapidly transmit action…

A: The atrioventricular bundle (bundle of His) is a continuation of the specialized tissue of the AV…