BIO 106 - Chapter 6 HW MAP - Exam 2
Which of the following is the intestinal response to PTH stimulation?
Calcium is absorbed quickly.
Which condition, due to excessive cartilage formation at the epiphyseal cartilages, results in individuals who are very tall, with long, slender limbs?
Marfan syndrome
The process of osteolysis is performed by which cell population?
Osteoclasts
In what area of a long bone would it probably be easiest to observe the cartilage the orthopedic doctor refers to?
Metaphysis.
Remnants of osteons whose matrix components have been almost completely recycled by osteoclasts are known as which of the following?
Interstitial lamellae
Ankle fractures that affect both bones of the leg are called:
Pott fractures.
All of the following are characteristics of periosteum except: a) It is an incomplete cellular layer that lines the medullary cavity. b) It provides a route for the blood and nervous supply. c) It has two layers, an inner layer and an outer layer. d) It actively participates in bone growth and repair.
A. It is an incomplete cellular layer that lines the medullary cavity.
What type of bone growth is the doctor most likely looking for in the example above?
Endochondral ossification.
Which bone is not formed via intramembranous ossification?
Femur
Part C - Continuing Long Bone Growth Bill, age 15, is still growing, but his older sister Andrea, age 19, has stopped. What has changed in Andrea's bones?
Her epiphyseal plates have ossified.
All of the following result in decreased calcium levels in the bloodstream, except:
PTH stimulation of osteoclasts.
The cartilage the doctor is referring to will disappear when?
The osteoblasts work faster than cartilage producing cells.
Part A - Early Ossification of the Cartilage Model Cells of the perichondrium need to take on a new role as ossification begins. They will become __________.
osteoblasts and begin to deposit bone matrix.
Part B - Ossification Centers As blood vessels extend into the spaces left by dying chondrocytes, the models begin to ossify internally. Where does internal ossification begin?
the primary ossification center in the diaphysis.
