Where would be the BEST place to find red marrow in an adult?
in the medullary cavity of a long bone
in the epiphysis of a flat bone
in the medullary cavity of a flat bone
in the epiphysis of a long bone
in the epiphyseal plate of a long bone
The Correct Answer is D
A. in the medullary cavity of a long bone
In adults, the medullary cavity contains yellow marrow, not red marrow.
B. in the epiphysis of a flat bone
Flat bones (e.g., skull) don’t have epiphyses. This answer is anatomically inaccurate.
C. in the medullary cavity of a flat bone
Flat bones don’t have a true medullary cavity. Red marrow is found in their spongy bone, not in a central cavity.
D. in the epiphysis of a long bone
Red marrow in adults is found in the spongy bone of the epiphyses of long bones and in flat bones like the sternum and pelvis.
E. in the epiphyseal plate of a long bone
The epiphyseal plate is made of cartilage, not marrow. It is involved in growth, not hematopoiesis.
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Related Questions
Correct Answer is C
Explanation
A. forms the parietal and frontal bones
These bones are formed by intramembranous ossification, not endochondral. Intramembranous ossification occurs directly from mesenchyme.
B. results when the mesenchyme condenses into a fibrous CT around brain
This describes intramembranous ossification, not endochondral. Endochondral ossification uses a cartilage model, not fibrous connective tissue.
C. occurs when bones develop from cartilage models
Endochondral ossification is the process by which long bones and most bones of the body are formed by replacing a hyaline cartilage model with bone.
D. occurs when multiple centers of ossification converge together
While multiple ossification centers do form during endochondral ossification (e.g., primary in diaphysis, secondary in epiphyses), this does not define the process-it’s development from a cartilage model that is essential.
Correct Answer is B
Explanation
A. axon
The axon transmits signals away from the neuron’s cell body toward other cells. Blocking it would prevent output, not input.
B. dendrite
Dendrites receive input from other neurons. Blocking dendrites would prevent the neuron from receiving synaptic signals.
C. synapse
The synapse is the junction between neurons. While blocking the synapse can prevent transmission, the question specifies receiving input, which happens at the dendrites.
D. synaptic cleft
This is the small gap between neurons where neurotransmitters are released. Blocking it affects signal transmission but not specifically the receiving end, which is the dendrite.
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