Certified Surgical Technologist Anatomy and Physiology 4

Question 1

Which layer of the heart wall is responsible for the contractile force of cardiac muscle?

Accepted Answer

Myocardium

Answer

The myocardium is the thick middle muscular layer of the heart wall composed of cardiac muscle cells that generate the pumping force.

Question 2

The triangles of the neck are important surgical landmarks. The carotid triangle contains which major vessels?

Accepted Answer

Common carotid artery, internal jugular vein, and vagus nerve

Answer

The carotid triangle contains the common carotid artery, internal jugular vein, and vagus nerve forming the carotid sheath, making it a critical surgical region.

Question 3

Which vertebral level marks the bifurcation of the abdominal aorta into the common iliac arteries?

Accepted Answer

L4

Answer

The abdominal aorta bifurcates into the right and left common iliac arteries at the level of the L4 vertebra, just below the umbilicus.

Question 4

In the context of surgery, which fascia encloses the rectus abdominis muscle and is commonly used as a graft or repair layer?

Accepted Answer

Rectus sheath

Answer

The rectus sheath is a strong fibrous compartment formed by the aponeuroses of the external oblique, internal oblique, and transversus abdominis muscles.

Question 5

The pleural cavity normally contains a small amount of fluid. What is its primary function?

Accepted Answer

Reducing friction during breathing

Answer

Pleural fluid lubricates the surfaces of the visceral and parietal pleura, reducing friction as the lungs expand and contract during respiration.

Certified Surgical Technologist Practice Test

Certified Surgical Technologist Practice Test

Certified Surgical Technologist Anatomy and Physiology 4