Which of these is NOT part of the dorsal cavity?

A. On the posterior side of the knee: The popliteal pulse is located behind the knee in the popliteal fossa. It is often deeper and harder to palpate compared to other pulses, but it is the correct site when assessing circulation in the lower extremity.

B. In the distal end of the lower leg: The distal lower leg is where the posterior tibial and dorsalis pedis pulses are assessed. These are important for evaluating foot circulation but are not the same as the popliteal pulse.

C. At the posterior side of the wrist: The posterior wrist is where the radial pulse is palpated. This site is commonly used for routine pulse checks but is unrelated to the popliteal artery location.

D. On the palmar side of the hand: Pulses in the hand can be felt at sites such as the ulnar artery, but these are not associated with the popliteal region. This location is far from the knee and does not correspond to the popliteal pulse point.

A. Serving as the site for ribosomal RNA synthesis: Ribosomal RNA is synthesized in the nucleolus, not the centrioles.

B. Forming the basis of cilia and flagella: Centrioles are cylindrical structures that organize microtubules and serve as basal bodies for the formation of cilia and flagella, which are essential for cell movement and fluid transport.

C. Providing a whiplike beating motion to move substances along cell surfaces: The beating motion of cilia and flagella is powered by motor proteins and microtubule interactions, not directly by centrioles.

D. Producing ATP: ATP production occurs in mitochondria, not in centrioles, which are structural and organizing components of the cell.