What is the primary function of cardiac muscle tissue?

• A. To store calcium for the body
• B. To pump blood throughout the body
• C. To move bones and produce voluntary movements
• D. To aid in digestion by moving food through the digestive tract

Answer: (B)

Verified step by step guidance

1. Understand the role of cardiac muscle tissue: Cardiac muscle tissue is a specialized type of muscle found exclusively in the heart. Its primary function is to contract rhythmically and involuntarily to pump blood throughout the body.
2. Differentiate cardiac muscle tissue from other muscle types: Cardiac muscle tissue is distinct from skeletal muscle (responsible for voluntary movements like moving bones) and smooth muscle (found in organs like the digestive tract to aid in digestion). Cardiac muscle is involuntary and works continuously without conscious control.
3. Analyze the options provided: The first option, 'To store calcium for the body,' is incorrect because calcium storage is primarily a function of bones and the sarcoplasmic reticulum within muscle cells, not cardiac muscle tissue. The second option, 'To pump blood throughout the body,' aligns with the primary function of cardiac muscle tissue. The third option, 'To move bones and produce voluntary movements,' describes skeletal muscle, not cardiac muscle. The fourth option, 'To aid in digestion by moving food through the digestive tract,' describes smooth muscle, not cardiac muscle.
4. Relate the structure of cardiac muscle to its function: Cardiac muscle cells are interconnected by intercalated discs, which allow for synchronized contractions. This structural feature ensures efficient pumping of blood throughout the body.
5. Conclude the correct answer: Based on the analysis, the primary function of cardiac muscle tissue is 'To pump blood throughout the body.' This is the correct answer because it directly corresponds to the role of the heart in the circulatory system.