Question

question 13 1 pts in an embryonic long bone, centers of ossification are found in the: diaphysis and distal epiphysis only; none of these, because the pattern depends on the particular bone; diaphysis only; diaphysis and each epiphysis question 14 1 pts when a bone breaks, a ______ forms until later being replaced with bone. growth plate; pore; topic: sec. 5.4; skill: understanding; callus; hematoma; cyst

Explanation:

Question 13

In embryonic long bones, there is a primary ossification center in the diaphysis and secondary ossification centers in each epiphysis (proximal and distal). So the centers of ossification are in the diaphysis and each epiphysis.

When a bone breaks, a hematoma (blood clot) first forms, but then a callus (a mass of tissue that helps in bone repair) forms and is later replaced with bone. Wait, correction: After hematoma, a fibrocartilaginous callus forms, then bony callus. But the option here: when bone breaks, the first thing is hematoma, but the question says "until later being replaced with bone". Wait, the process: fracture → hematoma → fibrocartilaginous callus → bony callus. But the options: callus (the fibrocartilaginous and then bony, but the one that forms and is replaced with bone? Wait, no: the callus (fibrocartilaginous) is replaced by bony callus. Wait, maybe the question is about the callus. Wait, no, let's recall: When a bone breaks, a hematoma forms initially, but then a callus (fibrocartilaginous) forms, which is later replaced by bone (bony callus). But the options: growth plate is for growth, pore is a space, cyst is abnormal, callus is the repair tissue. Wait, the correct answer is callus? Wait no, hematoma is the first, but then callus. Wait, the question says "forms until later being replaced with bone". So the structure that forms and is replaced by bone is the callus? Wait, no, hematoma is replaced by granulation tissue, then fibrocartilaginous callus, then bony callus. But the options: callus (fibrocartilaginous) is replaced by bony callus. So the answer is callus? Wait, no, maybe I made a mistake. Wait, the correct process: Fracture → Hematoma (blood clot) → Fibrocartilaginous callus (soft callus) → Bony callus (hard callus) → Remodeling. So the "callus" (fibrocartilaginous) forms and is later replaced with bone (bony callus). So the answer is callus? Wait, but the options have hematoma. Wait, hematoma is the initial blood clot, which is replaced by granulation tissue, then callus. So maybe the question is referring to the callus. Wait, let's check the options again. The options are growth plate, pore, callus, hematoma, cyst. So the correct answer is callus? Wait, no, hematoma is the first, but the question says "until later being replaced with bone". So the structure that is replaced with bone is the callus. So the answer is callus.

Answer:

diaphysis and each epiphysis

Question 14