Why is the rate of cardiac muscle relaxation faster when a positive inotropic agent is present?

Q: Why do we need to prevent the decompensated state in patients with heart failure?

A: Decompensation is any functional decline of a system or structure which was operating earlier with…

Q: A patient has tachycardia. Would you recommend a drug that prolongsor shortens the plateau of…

A: Tachycardia is a condition that makes our heart beat more than 100 times per minute. There are three…

Q: What are Cardiac Action Potentials?

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

Q: Explain the electrical events that generate each portion of the electrocardiogram.  How do they…

A: Heart conduction is necessary for blood regulation. As these conduction activities are related to…

Q: What is the mechanism behind the action potentials in the pacemaker cells?

A: A random, propagating, transitory and fast change of the muscle or nerve cell's resting membrane…

Q: Compare the action potentials of contractile cardiac muscle. autorhythmic cardiac muscle and…

A: In cardiac muscles, the action potential is initiated by the sinoatrial node that travels down the…

Q: Why is atherosclerosis a risk factor for thrombotic stroke?

A: Blood is an important body fluid that helps to transport respiratory gases, nutrients, and…

Q: What is the Frank–Starling law of the heart? What is its significance?

A: In the cardiovascular system, circulated blood flow from the left ventricle is called stroke volume…

Q: How is cardiac output calculated?

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

Q: Why is it possible for acetylcholine to actually cause an increase in stroke volume, even though…

A: Acetylcholine is one of the most vital neurotransmitter in the human body, that is seen in both the…

Q: What factors regulate heart rate during exercise? Stroke volume?

A: The cardiovascular system comprises the heart, blood vessels, and lungs. It is also named the…

Q: What initiates action potentials in cardiac muscle?

A: Generation of action potential activates the neuron during the generation of stimuli. It is studied…

Q: Exercise-induced stress increases cardiac output and vasoconstriction, so why does the amplitude of…

A: Heart rate is defined as the number of times the heart beats per minute. A typical heart rate ranges…

Q: Briefly describe the events of excitation-contraction coupling in cardiac muscle cells.

A: Cardiac muscles are also called myocardium, which is a type of muscle in the body that is…

Q: What are the uses of cardiac troponins?

A: Troponins are a group of protein molecules that are found in skeletal and cardiac muscles. The…

Q: Describe the functional significance of the skeletal muscle pump and illustrate the action ofvenous…

A: Blood is a type of connective tissue that helps in circulating oxygen and nutrient throughout the…

Q: Describe the action potential of an autorhythmic cell in the heart. a) Indicate how the opening and…

A: Answer 1- the opening and closing of each ion channel affects the membrane potential of the cell can…

Q: Explain the term “Exercise is cardio-protective”?

A: An activity or a process is defined as cardioprotective when it contributes directly or indirectly…

Q: How does the excitation-contraction coupling in skeletal muscles and in cardiac muscles differ?

A: Introduction: The excitation/ depolarization of the muscle fiber results in developing action…

Q: Describe the mechanisms that increase the cardiac output during exercise and that increase the rate…

A: When a person is exercising there are various circulatory changes that occur in his/her body. The…

Q: Draw a ventricular muscle cell action potential.

A: The heart is a four chambered structure that is responsible for pumping the blood into the arteries…

Q: What causes the pacemaker cells of the SA node to trigger an action potential?

A: The heart is made up of cardiac muscle. It contains a network of specialized cardiac muscle fibres…

Q: If a heart lacked gap junctions, an organ-level contraction would occur.True/False

A: Cardiac muscles are the striated, involuntary, and branch muscles with a characteristic feature of…

Q: What is fibrillation and why can it be life-threatening?

A: Normally the heart muscle contractions occur in a synchronized manner. This synchronization is…

Q: Describe the properties of the cardiac muscle, including automaticity, excitability, conductivity,…

A: Cardiac muscle or heart muscle is also known as myocardium. It is one of the three kinds of…

Q: How does digitalis result in an increased contractile force of cardiac muscle?

A: The muscular system consists of three types- Smooth muscle Skeletal muscle Cardiac muscle Cardiac…

Q: What is the most accurate way to calculate resting heart rate?

A: The resting heart rate refers to the rate at which the heart is pumping the blood when the body is…

Q: How does excitation–contraction coupling in cardiac muscle resemble that of skeletal muscle? How is…

A: The calcium ions channels present in the plasma film are momentarily opened because of the…

Q: Why would blocking the action of a vasoconstriction lower blood pressure?

A: Circulatory system is a type of body system in which circulation of body fluids occur and…