Human Anatomy and Physiology : Help with Erythropoiesis

Study concepts, example questions & explanations for Human Anatomy and Physiology

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Example Questions

Example Question #1 : Help With Erythropoiesis

Erythropoiesis takes place in which section of long bones?

Possible Answers:

Haversian canal

Lacuna

Epiphysis

Articular cartilage

Diaphysis

Correct answer:

Epiphysis

Explanation:

The ends of long bones, called epiphyses, contain spongy bone. Spongy bone contains red bone marrow, which is the site of erythropoiesis.

The shaft of the long bone is the diaphysis and houses yellow bone marrow, which mainly functions for fat storage. Articular cartilage is found on the exterior of the bone and helps to lubricate and provide cushioning for joints. Lacunae are small gaps in the hydroxyapatite matrix that house osteocytes. The Haversian canal runs through the center of an osteon and serves to house the blood vessels and nerves associated with bone.

Example Question #2 : Help With Erythropoiesis

When there is decreased oxygen in circulation, an organ senses this and secretes a hormone. Which organ and what hormone are in play?

Possible Answers:

The liver and RBC factor 2

The kidneys and erythropoietin

The liver and RBC factor 1

The liver and erythropoietin

The kidneys and RBC factor 1

Correct answer:

The kidneys and erythropoietin

Explanation:

The bone marrow makes new red blood cells in a process called erythropoiesis. This is stimulated by the kidneys detecting decreased levels of oxygen in the blood stream. They then release a hormone called erythropoietin which stimulates the bone marrow to make more erythrocytes or red blood cells.

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