Cardiac muscle does not exhibit tetanus because it hasa) Fast Ca ++ channels b) Scanty sarcoplasmic reticulum (SR) c) A long absolute refractory period d) Electrical synapses e) Exclusively aerobic respiration

Answer: c

Explanation: THE REFRACTORY PERIOD OF CARDIAC MUSCLE IS LONGER THAN SKELETAL MUSCLE

Final answer:

Cardiac muscle does not exhibit tetanus because it has a long absolute refractory period, electrical synapses, and relies primarily on aerobic respiration.

Explanation:

Cardiac muscle is a specialized type of muscle found in the heart. Unlike skeletal muscle, which can exhibit tetanus (sustained contraction), cardiac muscle does not. This is due to several factors.

Firstly, cardiac muscle has a long absolute refractory period. The absolute refractory period is the period of time during which the muscle cannot be stimulated to contract again. This refractory period allows the heart to relax and refill with blood before the next contraction. It prevents the muscle from being stimulated again before it has fully relaxed.

Secondly, cardiac muscle cells are connected by electrical synapses called gap junctions. These gap junctions allow electrical signals to pass quickly from one cell to another. This synchronized contraction prevents tetanus from occurring.

Lastly, cardiac muscle relies primarily on aerobic respiration. Aerobic respiration provides a steady supply of energy for contraction without the buildup of metabolic waste products that can lead to tetanus.

Learn more about cardiac muscle and tetanus here:

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