Question

select all that apply
indicate three characteristics of cardiac muscle.
cardiac muscle cells have abundant mitochondria.
cardiac muscle cells lack sarcoplasmic reticulum.
cardiac muscle lacks striations.
each cardiac muscle cell has a single nucleus.
cardiac muscle cells contain a system of transverse tubules.

Explanation:

• Cardiac muscle cells need a lot of energy (from mitochondria) for continuous contraction.
• Cardiac muscle cells have a single nucleus.
• They contain transverse tubules for efficient signal conduction.
• Cardiac muscle cells have some sarcoplasmic reticulum (not lack it).
• Cardiac muscle has striations (due to sarcomeres).

Answer:

• Cardiac muscle cells have abundant mitochondria.
• Each cardiac muscle cell has a single nucleus.
• Cardiac muscle cells contain a system of transverse tubules.