nmdcat.online
BIO NMDCAT Muscles
nmdcat.online July 28, 2026

Which feature enables cardiac muscle to contract continuously throughout life without conscious effort?

A. Voluntary nerve control
B. Presence of intercalated discs
✓
C. Attachment to bones
D. Absence of mitochondria

📝 Explanation

Correct: Intercalated discs electrically and mechanically connect cardiac muscle cells, allowing synchronized contractions. A: Cardiac muscle is involuntary. C: Cardiac muscle is not attached to bones. D: Cardiac muscle contains numerous mitochondria. Concept: Adaptations of cardiac muscle.

📖 Additional Information

  • Voluntary nerve control
  • Presence of intercalated discs
  • Attachment to bones
  • Absence of mitochondria

Correct: Intercalated discs electrically and mechanically connect cardiac muscle cells, allowing synchronized contractions. A: Cardiac muscle is involuntary. C: Cardiac muscle is not attached to bones. D: Cardiac muscle contains numerous mitochondria. Concept: Adaptations of cardiac muscle.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

During digestion, rhythmic contractions move food through the alimentary canal. These contractions are produced mainly by:

Next Question

Compared with skeletal muscle, smooth muscle cells are:

Back to All Questions

🔗 Related MCQs

Concerning the duration of muscle twitches, if a skeletal muscle twitch lasts approximately 10-100 milliseconds, what is the expected duration of a typical smooth muscle contraction?
July 28, 2026
The physiological response to hypoxia (low oxygen) differs among muscle types. Which muscle type is most susceptible to irreversible damage following a brief period of hypoxia?
July 28, 2026
A medical relevance of understanding muscle tissue differences is the development of calcium channel blockers. These drugs are primarily used to treat hypertension (high blood pressure) and angina. They exert their biological effect mainly by acting on:
July 28, 2026
During the process of cell differentiation, which muscle type loses its ability to divide and form new cells almost completely, relying solely on hypertrophy for growth?
July 28, 2026
The functional relationship between the shape of a muscle cell and its tissue type is evident when observing spindle-shaped cells. This specific morphology allows the cells to:
July 28, 2026

Categories

View all →