Which of the following is made up of smooth muscle tissue?
Heart
Rectus abdominis
Esophagus
Pectoralis major
The Correct Answer is C
A. The heart is composed of cardiac muscle tissue, not smooth muscle. Cardiac muscle is specialized for rhythmic contractions to pump blood.
B. The rectus abdominis is composed of skeletal muscle tissue, which is voluntary and allows for movement of the trunk.
C. The esophagus contains smooth muscle tissue in its walls, which is responsible for the involuntary contractions (peristalsis) that move food from the mouth to the stomach.
D. The pectoralis major is composed of skeletal muscle tissue, which allows for voluntary control of arm movements.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. While phagocytes can move to areas of damage, their primary function is not to clump together and adhere to tissues, but rather to engulf and digest foreign materials.
B. Phagocytes, such as macrophages and neutrophils, are specialized white blood cells that ingest and digest foreign pathogens, dead cells, and debris within damaged tissues. This is their main characteristic and function.
C. The release of histamine is typically associated with mast cells, not phagocytes. Histamine helps to initiate inflammatory responses, but phagocytes are involved in engulfing pathogens rather than releasing histamine.
D. Transporting oxygen from the lungs to tissues is the role of red blood cells, not phagocytes. Phagocytes are involved in immune defense, not oxygen transport.
Correct Answer is B
Explanation
A. While phagocytes move to areas of infection or damage, their primary role is not clumping together and adhering to tissues but rather engulfing and digesting foreign particles.
B. Phagocytes, such as neutrophils and macrophages, are white blood cells that ingest and digest foreign pathogens, dead cells, and debris in damaged tissues. This is their primary function in the immune response.
C. Releasing histamine is the function of mast cells, not phagocytes. Histamine is involved in initiating inflammation, but phagocytes are focused on clearing pathogens and debris.
D. Transporting oxygen is the function of red blood cells, not phagocytes. Phagocytes are involved in immune defense, not in the transport of oxygen.
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