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

Q: What are Cardiac Action Potentials?

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

Q: What type of catabolism occurs in the heart?

A: Catabolism defines the set of reactions in which a large molecule is broken down into small, simpler…

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

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

Q: splanchnic, cutaneous, and skeletal muscle vascular beds during sustained exercise (distance

A: The amount of blood pumped by the left ventricle in a minute is called as the cardiac output. It's…

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: 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: 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…

Q: How does a positive inotropic agent increase the strength of cardiac muscle contraction?

A: A positive inotropic agent is any drug or medication that can change the force of contraction with…

Q: What effect does hypocalcemia have on the contractile force developed by cardiac muscle?

A: Calcium plays an important role in the activity of muscles. It is released in the muscles from the…

Q: What is the concept of Cardiac Output Max, Cardiac Output Rest, and Cardiac Output Reserve?

A: The heart, which pumps blood, is a crucial organ. All parts of the body receive oxygen and nutrients…

Q: How is long refractory period beneficial for cardiac muscles?

A: Introduction: The heart is a muscular beating organ that transports deoxygenated blood to the lungs…

Q: 5) what causes the plateau phase during a cardiac muscle action potential? a) open voltage gated K+…

A: Heart/Cardiac muscle's main work is to generate force in order to pump blood into the bloodstream.…

Q: What are the two functional importances of the intercalated discs of cardiac muscle?

A: The intercalated discs are a specific feature of cardiac muscle fiber where it supports synchronized…

Q: In a cardiac contractile cell what is the mechanism involved in the change in membrane potential?…

A: The cardiac contractile cell undergoes various changes in order to perform several activities and…

Q: Describe the structure of intercalated discs in cardiac musclecells, and briefly discuss their…

A: Cardiac muscle tissues are tissues of the heart and help to provide strength and flexibility from…

Q: How do the compensatory responses triggered in heart failure work to restore cardiac output, and how…

A: Heart failure, the final stage of many cardiac disorders, occurs when the heart cannot maintain…

Q: Describe the conditions at the sarcolemma of cardiac muscle cells at rest.

A: They are connected by intercalated discs. These are striated fibres with a single nuclei. Sarcolemma…

Q: What is the most characteristic feature of a wandering pacemaker rhythm?

A: The Heart is a vital part of the body, it supplies the blood to the various body part, organs. It is…

Q: Why is afterload important to cardiac function?

A: Introduction: For the proper functioning of heart, optimum pressure for the ejection of blood flow…

Q: How does a positive inotropic agent decrease the duration of cardiac muscle contraction?

A: Cardiac muscle contraction occurs within the heart muscle when myosin protein binds with adenosine…