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Which of the following statements is true regarding cardiac muscle tissue?
It is voluntary in nature
It consists of non-striated cells
It is involuntary and found only in the heart
It is multi-nucleated and cylindrical
It is involuntary and found only in the heart
Cardiac muscle tissue is a specialized type of involuntary, striated muscle found exclusively in the wall of the heart, known as the myocardium. It contracts rhythmically and autonomously without conscious control to pump blood throughout the circulatory system.
Cardiac muscle tissue is a specialized type of involuntary, striated muscle found exclusively in the wall of the heart, known as the myocardium. It contracts rhythmically and autonomously without conscious control to pump blood throughout the circulatory system.
Think of the cardiac muscle as an automatic, self-starting motor in a car that runs 24/7 without needing the driver to push a pedal.
I-I-H: Involuntary, Intercalated discs, Heart only.
F=dtdPтАЛ тАФ relationship between force of contraction and rate of blood pressure change
╬ФV=IтЛЕR тАФ electrical coupling via gap junctions where R is resistance
The heart contains specialized cells called myocytes that are interconnected by intercalated discs containing gap junctions. These junctions allow rapid diffusion of ions, facilitating the spread of action potentials (VmтАЛтЙИтИТ90┬аmV at rest) between cells for synchronized contraction. This rhythmic activity is regulated by the sinoatrial (SA) node, which acts as the natural pacemaker.
Cardiac muscles are striated, similar to skeletal muscles, but contain only one or two central nuclei.
Intercalated discs are unique features that provide mechanical strength and electrical continuity.
Cardiac tissue is highly resistant to fatigue due to high mitochondrial density.
Contraction is myogenic, meaning it originates from within the heart muscle itself.
Does not fatigue easily
Allows for synchronized, rhythmic pumping
Limited regenerative capacity compared to other tissues
Circulatory system maintenance
Continuous systemic oxygen transport
A) Voluntary muscles are Skeletal muscles, controlled by the somatic nervous system.
B) Cardiac muscles are striated due to the arrangement of actin and myosin filaments.
D) Cardiac cells are typically uni-nucleated or bi-nucleated, whereas skeletal cells are multi-nucleated.
C is correct тАФ Cardiac muscle tissue is involuntary and found exclusively in the heart.
Always differentiate muscles by two parameters in exams: control (voluntary/involuntary) and appearance (striated/non-striated). Skeletal=Voluntary/Striated, Smooth=Involuntary/Non-striated, Cardiac=Involuntary/Striated.