Muscular Physiology Quiz

Smooth muscle is responsible for involuntary movements due to its location in organs like the digestive system and respiratory tract.

Extensibility is the ability of muscle fibers to stretch without being damaged, allowing flexibility and range of motion.

The sarcolemma is the specialized plasma membrane of a muscle fiber, essential for muscle cell integrity and function.

Skeletal muscle has striations and is under voluntary control, allowing conscious movement.

Contractility is the ability of muscle fibers to generate force, enabling muscle contraction.

The sarcoplasmic reticulum regulates calcium ions, crucial for muscle contraction, by releasing and storing them.

Acetylcholine is released at the neuromuscular junction, initiating muscle contraction by binding to receptors on the muscle cell membrane.

Lactic acid accumulates in muscle cells during anaerobic respiration, leading to fatigue and muscle soreness.

Myosin is the structural protein that interacts with actin filaments to generate the force required for muscle contraction.

A sarcomere is the smallest functional unit of a muscle fiber, containing overlapping actin and myosin filaments.

Skeletal muscles do not regulate blood glucose levels; this function is primarily performed by the liver and pancreas.

Acetylcholinesterase breaks down acetylcholine at the neuromuscular junction, terminating muscle stimulation.

Hypertrophy refers to the increase in muscle size resulting from the enlargement of individual muscle fibers.