True or false: Cardiac muscle is striated and involuntary.

Question

BlackTom AI · Accepted Answer

The statement to evaluate is: 'Cardiac muscle is striated and involuntary.'

Option 1: True
- This option correctly identifies two key features of cardiac muscle: it is striated, meaning its microscopic structure shows the banding pattern similar to skeletal muscle due to the arrangement of actin and myosin filaments. 
- It is also involuntary, meaning its contraction is not under conscious control; the heart’s rhythm is regulated primarily by the autonomic nervous system and intrinsic pacemaker activity, rather than voluntary effort.
- Additionally, cardiac muscle cells connect via intercalated discs, which support synchronized contraction, reinforcing why the involuntary, rhythmic beating characteristic of the heart is achieved.

Option 2: False
- This statement would be incorrect because it claims a mismatch with the true nature of cardiac muscle. If one claimed cardiac muscle were non-striated, that would apply to smooth muscle, not cardiac muscle. If one claimed cardiac muscle were voluntary, that would also be incorrect, since voluntary control is a hallmark of skeletal muscle, whereas the heart operates involuntarily.
- A faulty explanation might confuse cardiac muscle with skeletal muscle or smooth muscle, overlooking cardiac muscle’s distinct features like striation, branching cells, and intercalated discs that enable automatic, coordinated contractions.

In summary, the combination of striations and involuntary control aligns with the established understanding of cardiac muscle physiology, while any assertion denying either characteristic would be inaccurate.

BIOL 251 Module 5 Problem Set

True or false: Cardiac muscle is striated and involuntary.

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