Systemic Anatomy Practice Questions

Q: Which of the following is the primary mechanism of bone growth?

Bone deposition. ***Bone deposition*** - Bone deposition, or **ossification**, is the process by which **osteoblasts** synthesize and secrete new bone matrix, leading to an increase in bone mass and size [1]. - This process is fundamental to both **endochondral ossification** (growth in length) and **intramembranous ossification** (growth in width and formation of flat bones) [2]. - Bone deposition is the **primary mechanism** responsible for increasing bone mass during growth, making it the correct answer. *Bone resorption* - Bone resorption is the process by which **osteoclasts** break down old or damaged bone tissue [1]. - While essential for **bone remodeling** and calcium homeostasis, it primarily decreases bone mass rather than contributing to growth. *Cortical drift* - **Cortical drift** refers to the movement or relocation of bone surfaces due to a combination of apposition (deposition) and resorption on different surfaces. - It is a mechanism of **bone remodeling** and shaping but not the primary process responsible for overall bone growth [2]. *None of the above* - This is incorrect because **bone deposition is indeed the primary mechanism of bone growth**, as it directly leads to the formation of new bone tissue and increase in bone mass. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1182-1184. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 662-663.

Q: About the ureter, which of the following is true?

25 cm long. ***25 cm long*** - The ureters are typically about **25 to 30 cm long** in adults, extending from the kidneys to the bladder. - This length allows for the efficient transport of urine through peristaltic contractions. *5 cm long* - A length of 5 cm is significantly too short for the ureter, which connects the kidney to the bladder. - No major urinary tract structure in adults is typically this short. *35 cm long* - While there can be slight variations, 35 cm is on the longer end and not the average length of the ureter. - The typical range is closer to 25-30 cm. *Primarily retroperitoneal, but may have intraperitoneal segments* - The ureters are **entirely retroperitoneal** structures, meaning they lie behind the peritoneum throughout their course. - They do not have intraperitoneal segments; organs that are intraperitoneal are completely surrounded by peritoneum.

Question 1

Which of the following is the most complete statement about the appendix?

Accepted Answer

It develops from the midgut and is supplied by the appendicular branch of the ileocolic artery.

Answer

It does not have mesentery.

Answer

It has taenia coli.

Answer

It develops from the midgut.

Question 2

Which of the following is the primary mechanism of bone growth?

Accepted Answer

Bone deposition

Answer

Bone resorption

Answer

Cortical drift

Answer

None of the above

Question 3

About the ureter, which of the following is true?

Accepted Answer

25 cm long

Answer

5 cm long

Answer

35 cm long

Answer

Primarily retroperitoneal, but may have intraperitoneal segments

Systemic Anatomy — MCQs

Systemic Anatomy — MCQs

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