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What part of blood pressure denotes the force exerted on the arterial walls during cardiac contraction?
The force exerted on the arterial walls during cardiac contraction is systolic blood pressure. In contrast, diastolic blood pressure is the force exerted during cardiac relaxation.
What can decrease the cardiac output?
The cardiac output can be decreased by decreasing the force of contraction of the ventricular myocardium and decreasing the heart rate.
Why does pericarditis cause a reduction in cardiac output?
because the force of myocardial contraction weakens
What is myocardial contractility?
Cardiac contractility is the force of contraction possible for any given length of the cardiac muscle. It is related to the intracellular calcium levels.
What structure allows for uniform contraction of the cardiac muscle?
The intercalated discs are specialized structures in cardiac muscle that allow for uniform contraction. They contain gap junctions, which allow for rapid electrical communication between cells, ensuring synchronous contraction of the heart muscle. Additionally, desmosomes in the intercalated discs help to physically link neighboring cardiac muscle cells, allowing for force transmission during contraction.
Which of cell type is specialized for contraction and generation of force?
The three types of muscle cells (cardiac, smooth and skeletal) fit this description.
Name four factors that influence contractile force and two that influence velocity and duration of contraction?
The four factors that influence contractile force are the number of muscle fibers stimulated, the relative size of the fibers, the frequency of stimulation and the degree of muscle stretch. Factors that influence the velocity and duration of contraction are the muscle fiber type, load and recruitment.
What is inotropic effect?
Inotropic effect refers to the ability of a drug or agent to alter the force of contraction of the heart muscle. Positive inotropic agents increase the force of contraction, while negative inotropic agents decrease it. These effects can affect cardiac output and overall heart function.
What is the cause of staircase phenomenon in case of cardiac muscle?
The staircase phenomenon occurs because of qiuck succession of stimuli with a time interval of only about 2 s between the stimuli. During this period,the beneficial effect is produced which facilitates the force of successive contraction. So there is a gradual increase in the force of contraction.
What refers to the strength of force of each heartbeat?
The strength of force of each heartbeat is referred to as cardiac contractility. It is a measure of the heart's ability to contract and pump blood efficiently. Factors such as heart rate, volume of blood, and hormones can influence cardiac contractility.
Muscle tissue consists of cells that are highly specialized for the function of?
Muscle tissue consists of cells that are highly specialized for the function of contraction. These cells contain proteins that allow them to generate force and movement. Muscle tissue can be classified into three types: skeletal, cardiac, and smooth muscle, each with unique properties related to their specific functions.
A contraction in which a muscle exerts force lengthens and is overcome by a resistance?
Eccentric contraction (isotonic)
