What is the significance of the extended refractory period in cardiac muscle?

Q: Following a large increase in sympathetic output from the vasomotor center, what tissues will get…

A: The sympathetic nervous system consists of the vasomotor center which is a part of the medulla…

Q: In what ways are autorhythmic fibers similar to and diff erent from contractile fibers?

A: Heart is a four chambered cardiovascular organ pumping blood throughout the body. The auricles and…

Q: What are Cardiac Action Potentials?

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

Q: Parasympathetic stimulation decreases the heart rate by Decreasing permeability of SA node cells…

A: Parasympathetic postganglionic nerve fibers tend to be vagus nerve and are cholinergic in nature.…

Q: Describe the process of Excitation–contraction coupling in cardiac muscle?

A: Excitation contraction is a process through which an action potential (electric stimulus) from the…

Q: Ventricular Contractility increases in response to circulating Epinephrine.  What factor is…

A: The heart is one of the vital organs of a human body. It is responsible for pumping blood through…

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: WHich are the properties of cardiac muscle

A: The Muscle is a soft tissue that contains actin and myosin protein filament that are responsible for…

Q: Complete the sentence: ions initiate depolarization of cardiac muscle cells and ions are responsible…

A: Excitability is defined as the ability of the living tissue to give response to a stimulus. In all…

Q: Cardiovascular system: Draw, label and describe the events that occur during an action potential…

A: The sinoatrial node (SA node) is a specialized myocardial structure that initiates the electrical…

Q: Explain the term isovolumetric ventricular contraction?

A: The cardiac cycle in animals is the result of the atrial and ventricular contraction and relaxation…

Q: Explain differences between action potentials of cardiac muscle cells and those in nodal cells of…

A: On the surface of the heart, muscle fibers are arranged to form a fused interconnected mass termed a…

Q: State some unique features of cardiac muscles.

A: Muscle is a soft tissue found in most animals. Muscles function to produce force and motion. There…

Q: Describe the process of Contraction Coupling in the Cardiac Muscle?

A: Answer: Introduction: Cardiac muscle, comprised of the contractile cells of the heart, contain a…

Q: If branch A is twice the length of branch B, what is true regarding the resistance in branch A…

A: The Poiseuille's law states that the flow of fluid is related to various factors including length…

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: What effect will an increase in parasympathetic activity have on heart rate, force of contraction,…

A: The  Autonomic nervous system (ANS) has two interacting systems: the sympathetic and parasympathetic…

Q: What is the role of Ca2+ in the shape and duration of an action potential. (Cardiac muscle cell)

A: The duration of an action potential for cardiac muscle cell is between 200-250 milliseconds. There…

Q: Describe the arrangement of cardiac muscle fibers.

A: BASIC INFORMATION MUSCLE It is a type of soft tissue which are found in most of the animals. The…

Q: Give description of blood supply in cardiac muscle?

A: Blood consists of a fluid medium called plasma in which the cells are suspended. Plasma transports…

Q: Explain the intercellular structures of cardiac muscle.

A: Heart is a muscular organ that pumps blood throughout the circulatory system. It is situated between…

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: Why is the plateau phase so critical to cardiac musclefunction?

A: The heart is a hollow muscular organ. It pumps the blood through the blood vessels of the…

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: 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: define Cardiac muscle,

A: Muscle is a soft tissue which is found in most animals. The tissues comprise muscle fibre called…

Q: What is the relationship between cardiac output and venous return in the steady state?

A: Cardiac output is the amount of blood pumped into the aorta by the heart per minute, and it is…

Q: If an individual had a disease that reduced the strength of cardiac muscle contraction, what aspect…

A: In vertebrates, cardiac muscle, also known as myocardium, is one of three major muscle groups found…

Q: Discuss the importance of smooth muscle cells present in the aorta and all arteries.

A: Smooth muscle is employed in vessels to control blood pressure and flow in the cardiovascular…

Q: Why does heart rate increase with exercise?

A: Exercise may be defined as any physical body activity that can increase the fitness of an individual…

Q: na cardiac auto-rhythmic cell what is the mechanism involved in the change in membrane potential…

A:

Q: Why is Sinus bradycardia often normal in athletes?

A: The average heart beat of a human at rest is about 60-100 beats per minute(bpm). Bradycardia is a…

Q: Knowing that a patient with chronic heart failure is using digoxin (digitalis) for more than 1 year,…

A: Digoxin is a medication that is commonly used to treat a variety of different heart conditions, such…

Q: In what ways is angiogenesis stimulated in skeletal muscle? In adipose tissue?

A: Skeletal muscle can be defined as one of three major muscle types, the others being known as cardiac…

Q: What type of cardiac rhythm is this??

A: Electrocardiogram (ECG): This is a simple test. this test can be used to check: -Heart's rhythm…

Q: How are preload, afterload, and contractility managed therapeutically in the patient with heart…

A: Heart failure is characterized by the heart’s inability to pump an adequate supply of blood to the…

Q: What are three anatomic or physiologic differences between skeletal muscle and cardiac muscle?

A: The biological level of the organization is a hierarchy in which the living thing and structures are…

Q: During heavy exercise, how much cardiac output may increase?

A: Cardiac output is the amount of blood pumped by the heart into the aorta in one minute. Heart beats…

Q: How are action potentials generated and conducted in myocardial and pacemaker cells?

A: The cardiac conduction system includes special muscle fibers.

Q: Which of the following characteristics is NOT a property of cardiac muscles? Group of answer choices…

A: Our body consists of three types of muscles Smooth muscles, skeletal muscles, and Cardiac muscles.…

Q: Why must this change occur? (in reference to how does the heart rate differ before and after…

A: The process of circulation or internal transport is carried out by the pumping organ of the body,…

Q: In which direction does Ca2+ move in response to the opening of voltage-gated Ca2+ channels: into or…

A: Voltage-gated ion channels are a type of transmembrane protein that forms ion channels that are…

Q: How much of the total cardiac output may increase during the performance of heavy exercise?

A: The word "cardiac output" refers to the amount of blood pumped by the heart every minute. The…