Describe the anatomy of movement of the wave of cell depolarization throughout the heart during the cardiac cycle.

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 how the pressure in the left ventricle and in the systemic arteries varies during the…

A: The heart is a muscular organ that is divided into the left and right sides to prevent the mixing of…

Q: Describe the effects of sympathetic neuron stimulation on cardiacmuscle during contraction and…

A: Contraction in cardiac muscle occurs with the help of the sliding filament model of contraction.…

Q: Trace the biochemical electrical pathways that result in cardiac conduction

A: The collection of specialized cardiac myocytes located in the heart walls that send electrical…

Q: Explain, using diagrams where appropriate, the sequence of events in a cardiac cycle

A: Introduction  The organ that pumps blood throughout our bodies is the heart, which is around the…

Q: Explain how the heart is a double pump and why this is significant

A: Human heart is situated in the space of thoracic cavity present between two lungs.

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: Identify and describe the size, shape, and location of the heart and the path of blood through the…

A: The cardiovascular system is one of the 11 major body organ systems that is concerned with the…

Q: Draw the pressure changes along the systemic and pulmonaryvascular systems during the cardiac cycle?

A: Along the systemic and pulmonary vascular systems during the cardiac cycle  the pressure which…

Q: Describe the structural and functional characteristics of cardiac muscle tissue and the cardiac…

A: the structural and functional characteristics of cardiac muscle tissue:

Q: Based on the concentration gradient of sodium, potassium, and calcium in cardiac myocytes, which of…

A: In a cell, the plasma membrane separates the internal environment (cytoplasm) from the external…

Q: Describe the pressure changes in the atria and ventriclesduring a cardiac cycle.

A: The heart is an organ found in animals which is specialised to pump blood in the body. The heart is…

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: Discuss Mechanical Events of the Cardiac Cycle?

A: The human heart contracts 72 times per minute at rest. During each heart beat, the heart chambers…

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 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: Why is the cardiac action potential propagated more slowly in an AV node cell then in an atrial or…

A: Impulse conduction occurs by the depolarization that results into action potential. It is initiated…

Q: 29. 30. State the significance of the longer action potential in a cardiac CONTRACTILE cell. State…

A: The myocardial contractile cells comprise the mass amount of the cells in the atria and ventricles.…

Q: Beginning in the SA node, diagram the normal sequence of cardiac activation(depolarization) and the…

A: Cardiac contractions are controlled by the heart’s specific excitatory and conductive mechanisms.…

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: list in sequence the components of the elctrical conducting system of the human heart

A: A pump of muscle tissue consists of a heart and a supply of energy and oxygen is required for 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: Describe the conductions of electrical signals through

A: The electrical signal starts in a group of cells at the top of our heart called the sinoatrial (SA)…

Q: Define afterload, and describe its effect on the pumpingeffectiveness of the heart

A: The heart is the muscular organ that is protected by the ribs in the body's thoracic cavity. It…

Q: Describe intrinsic regulation of the heart.

A: Intrinsic regulation is the ability of an organ to maintain homeostasis within itself. Through…

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

A: Inotropic agents refer to those substances that either increase or decrease the force of contraction…

Q: Explain Graphic illustration of the position of a cardiac pacemaker?

A: The transportation of blood in the body is the function of the human circulatory system, also called…

Q: Identify the parts of the cardiac conduction system

A: The heart is the main organ of the human body that pumps oxygenated blood to the whole body and…

Q: During the isovolumetric periods there is no change in volume.

A: Isometric contraction or isovolumetric  period is an event that occurs in the early stages of…

Q: Discuss the heart contraction on a cellular level, describing the contraction muscle fiber?

A: Introduction: The muscle cells comprise protein filaments, namely, myosin and actin, that slide upon…

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.