1. What happens when the pressure in the ventricles becomes lower than the pressure in the atria? A.the semilunar valves open B.the semilunar valves close C.the atrioventricular valves open D.the first heart sound occurs   2. Pressure is changed by changing ___ which the ventricles control through contraction and relaxation. A.temperature B.flow C.resistance D.volume E.charge   3. If the pressure in the ventricles is higher than the pressure in the atria, but lower than the pressure in the great arteries, which of the following is true? A.semilunar valves will be closed, but the atrioventricular valves will be open, ventricles will be filling B.both the atrioventricular and semilunar valves will be open and there will be flow through the ventricles C.the atrioventricular valves will be closed, but the semilunar valves will be open, ventricles will be ejecting blood C.both the atrioventricular and semilunar valves will be closed and there will be no flow of blood

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: 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: which of the following is the pacemaker of the heart?

A: Heart  Heart is the pumping organ of animals it is made up of cardiac muscles. The heart of human…

Q: When is the blood pressure in the left ventricle greater than the blood pressure in the aorta?   A…

A: Cardiac cycle is a cycle through which atrial contraction ends with  ventricular relaxation. When…

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: The pressure in the lung/gill capillaries and systemic capillaries are the same A) True of two…

A: Pulmonary circulation is the movement of blood from the heart to the lungs. It carries deoxygenated…

Q: Which of the following occurs during ventricular diastole? a-The ventricles contract to force blood…

A: During ventricular diastole, the following occur- b- The ventricles relax and refill with blood c-…

Q: What happens when the pressure in the ventricles becomes lower than the pressure in the atria?…

A: Answer  a) the atrioventricular valves open

Q: During surgery, the right vagus nerve was accidently cut. Explain the effect on the heart rate. a.…

A: It has three components: blood, heart and the blood vessels. Heart is derived from the mesodermal…

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: Which of these is an incorrect statement concerning the heartbeat?a. The atria contract at the same…

A: The heartbeat has two parts, systole when the heart contracts and pumps blood and diastole when the…

Q: 1. Explain the features of the following structures: a) High elastic fiber content in the aorta b)…

A: Introduction: The aorta is the main artery in the human body, originating from the left ventricle of…

Q: 1. The source of the electrical currents that you measured on the skin throughout a normal…

A: Note: According to the given guidelines, we are supposed to answer only one question (1st question).…

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: 2)Which structure is labelled "M"? Aorta Cardiac muscle Inferior vena cava Left atrium Left…

A: The Human heart is a muscular organ located behind the breastbone and situated slightly to the left.…

Q: In some reptiles, the two layers of dura mater fuse together in the brain. What is a likely…

A: The dura mater is the tough outer layer of tissue that covers and protects the brain and spinal cord…

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: 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: 20. Which of the following is the most (largest) muscular chamber in a bird's heart or a mammal…

A: 20.) Answer is d.)  left ventricle.  21.) Answer is c.)  capillaries.

Q: 7) which of the following has the thickest wall? A) left ventricle B) right ventricle C) left atrium…

A: Please note that the answer is provided for MCQ # 7 and # 10. As all of these are separate…

Q: Cardiac output can decrease by .. a. Increasing pressure in veins. b. Drugs with positive inotropic…

A: Introduction:- Cardiac output is defined as the blood ejected from the heart per minute. Cardiac…

Q: What does the circled structure do?

A: Heart Mesodermally derived organ, is situated in the thoracic cavity between the lungs, slightly…

Q: 8. After passing through the aortic semilunar valve, a red blood cell accidentally flows backwards…

A: The aortic semilunar valve is the valve that is present between the left ventricle and the aorta.…

Q: 1)Which structure is labelled "L"? Aorta Cardiac muscle Inferior vena cava Left atrium Left…

A: Heart is a hollow muscular organ of circulatory system that functions to pump blood through the…

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: 7. The P-Wave in the electrocardiogram...   A)Gives information about the oxygenation content of…

A: The correct answer is Option D.Each cardiac cycle is of 0.8 seconds. Electrocardiogram (ECG) is a…

Q: patient hospitalised with aortic stenosis has activity intolerance related to insufficient oxygen…

A: As we know Aortic stenosis is one of the most frequent and severe valve diseases. The aortic…

Q: Which is not true about our heart A. ventricular systole squeezes blood to the lungs and the body B.…

A: Heart is a muscular organ that helps puno blood to different body organs. It has four chambers,…

Q: 1- The left ventricular wall of the heart is thicker than the right wall in order to…

A: Introduction :- Near the heart base, the ventricular wall is thickest, and it thins out to 1-2 mm at…

Q: The normal pacemaker of the heart is the ______.   A sinoatrial node   B left atrium   C…

A: Heart is an important organ that pumps blood. Heart is myogenic in nature meaning it is capable of…

Q: 2. In an accident, a victim is found bleeding. The blood flows out of the victim's wrist in a smooth…

A: There are three types of blood vessels: arteries, veins, and vessels. Every one of these assumes…

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: Heart failure occurs when   a. the cardiac output is 15 liters per minute when you are watching…

A: A heart failure means that the heart muscle doesn't actually  pump as much blood as per  body…

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

A: Rhythmic pulsation of the heart as a result of an action potential is known as the heartbeat. The…

Q: Which of the following changes happen at birth or a couple hours afterward? A) The connection…

A: After birth, several changes take place in the circulation of blood via the heart. After…

Q: The advantage of having a heart with two atria is that a) oxygenated and deoxygenated blood are…

A: The human heart has 4 chambers :  Left atrium Right atrium Left ventricle Right ventricle The…

Q: An increase in mean blood pressure may be due to? a) an increase in heart rate b) an increase in…

A: During blood flow, blood exerts a force on the blood-carrying vessels. We know the pressure is the…

Q: The heart’s internal pacemaker beats by: a. an internal implant that sends an electrical impulse…

A: The heart is a muscular organ in numerous animals, which siphons blood through the veins of the…

Q: 3. Which side of the heart pumps oxygenated blood to the body a. Left side b. Right side

A: The heart is the organ which pumps the blood to the body. The heart is the link between the lungs…

Q: One difference between the semilunar valves and the atrioventricular valves is that only the…

A: The valves that are found between the atria and ventricles are termed as atrioventricular valves,…

Q: 2. Relate the time and the heart rate and breathing rate? A) Heart and breathing rate increase as…

A: A natural, inherent process known as the circadian rhythm regulates a body's sleep-wake cycles and…

Q: 2. During exercise, an increase in sympathetic nervous system activity leads to constriction in most…

A: Whenever there is vasoconstriction in the skeletal muscle bed, there will be increased peripheral…

Q: The left ventricular wall of the heart is thicker than the right wall in order to ________.   A…

A: Heart is muscle which pumps blood to all parts of your body to provide it with the oxygen and…

Q: Which of these events occurs during (ventricular) systole? A)Only the left ventricle contracts.…

A: Diastole and systole are two phases of the cardiac cycle. Systole occurs when the heart contracts to…

Q: f the sinoatrial node stopped generating action potentials the heart would _____.   A stop beating…

A: The heartbeat starts with an impulse generated by the sinoatrial node (SA node) also known as the…