The second heart sound results from vibrations generated by the ______ of the _____ valves.   A opening; atrioventricular   B opening; atrioventricular and semilunar   C closing; atrioventricular   D closing; semilunar

Q: Which part of the heart is responsible for initiating and maintainingthe rhythmic activity of the…

A: The heart is a muscular organ that pumps blood throughout the body. It is located in the middle…

Q: Coronary vessels - these supply the heart with a blood supply of its own. -They can be seen in the…

A: The heart contain valves which allow the flow of blood in only one direction and prevent the…

Q: Atrial fibrillation (AF) is a rapid and unorganized beating of the upper chambers of the heart.  It…

A: If the hazard ratio is 0.60, the likelihood of surviving one day with this diagnosis is 99.4%, the…

Q: The atria contract duringa. the first heart sound.b. the second heart sound.c. the QRS complex.d.…

A: The human heart is situated in the middle of the thoracic cavity in a space called the mediastinum.…

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: The coronary arteries branch off of the ________.a. aortic valveb. ascending aortac. aortic archd.…

A: The human heart is a four-chambered muscular organ that pumps blood throughout the body. It pumps…

Q: The myocardium would be the thickest in the ________.a. left atriumb. left ventriclec. right…

A: Myocardium refers to the heart muscles that are responsible for making the walls of the heart.…

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: The pulmonic semilunar valve is located between the

A: The valves in the heart close to prevent the backflow of the blood. AV valves close to prevent the…

Q: The trabeculae carneae are located in the __________.   A epicardium   B ventricles   C atrium…

A: Step 1 The trabeculae carneae or columnae carneae are either rounded or irregular muscular columns…

Q: Blood leaves the right ventricle by traveling across the _____valve . ?

A: The cardiovascular thoracic muscular organ called the heart is anatomically divided into four…

Q: Maximum aortic pressure during the cardiac cycle is called pressure

A: The human heart is a muscular organ which pushes blood into the circulatory system's arteries and…

Q: When carotid and aortic baroreceptors reduce their output, _______. Select all that apply. Group…

A: Baroreceptors are mechanoreceptors that identifies the fluctuations in the blood pressure. They are…

Q: A common symptom of left ventricular failure is ________, which is difficulty breathing when lying…

A: Left ventricular failure is a condition where the left ventricle, the heart's main pumping chamber,…

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 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 part of the heart is responsible for the muscular contractions that pump blood through it?…

A: Heart is a muscular organ present in thoracic cavity which helps in blood flow through out the body.

Q: The heart has many anastomoses. What benefit are these to the heart?

A: Arteries that supply blood to the cardiac muscle is anastomoses. There are three types:…

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 heart beats without extrinsic stimulation from the autonomic nervous system. True or False

A: We know that The autonomic nervous system can be defined as the type of nervous system which…

Q: A pacemaker is a small device that is placed in the chest or abdominal help control abnormal heart…

A: Introduction A pacemaker is a small, battery-operated device used to control an irregular heart…

Q: The ________ layer secretes chemicals that help to regulate ionic environments and strength of…

A: The heart consists of muscular fibers and fibrous rings which helps to attach them in their specific…

Q: The volume of blood ejected from the left ventricle in each beat is ventricle. A greater than B…

A: The heart is a highly muscularized, involuntary organ of the body. It has four chambers consisting…

Q: In humans, blood returning to the heart from the lungs returns toa. the right ventricle. d. the left…

A: In humans, the route of blood through the pulmonary circuit is as follows: Right ventricle -->…

Q: The sinoatrial node develops from an embryonic heart tube chamber called the _____.

A: Heart  Heart is a mesodermal origin. It is located in the thoracic (chest) cavity(under the rib…

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: Mitral valve prolapse, which is abnormal, may allow blood to enter the ______ during contraction of…

A: The heart has four chambers and a series of valves that controls the flowing blood in and out of the…

Q: Most blood flowing in all of the following arteries except the _____ is destined to circulate…

A: The fluids that are produced in the body and either circulated within the body or secreted out are…

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: These These blood vessels are the [Select] arteries and the V[ Select ] veins and their function is…

A: The arteries, arterioles, veins, venules and capillaries are the blood vessels forming the…

Q: The lower chambers of the heart that contract to push blood out of the heart are called ___.

A: Heart is a muscular organ that pumps blood throughout the body.

Q: During diastole the blood pressure in the left ventricle is _______.   A lower than the pressure in…

A: The heart is a highly muscularized, involuntary organ of the body. It has four chambers consisting…

Q: The upper chambers of the heart that receive blood are called ___.

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

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

A: The correct answer is Endocardium .

Q: The two _____ veins unite like an upsidedown Y to form the inferior vena cava

A: Veins are blood vessels that carry blood to the heart. Most of the veins carry deoxygenated blood…