tissu e development changes due to aging from all of the following factors EXCEP
ID: 189794 • Letter: T
Question
tissu e development changes due to aging from all of the following factors EXCEPT 52 Bone Increased production of collagen fibers relative to calcified bone Osteoclastic activity outpaces osteoblastic activity b. c Sex hormone production diminishes d. Demineralization of bone e. Decreased rate of protein synthesis 53. Which type of cell resides in the lacuna of the osteon? a. Oteogenic cells b. Osteoblasts c. Osteocytes d. Osteoclasts Which statement is true about bone marrow? a Most bones have red marrow when we are adults b Yellow marrow contains adipose tissue c. The medullary cavity is where the red marrow is located d. Red marrow is typically found in the flat bones of the skull e. Two of these 54 55. a. b. c. d. stimulates the production of collagen fibers in bone Vitamin C Vitamin D Insulin-like growth factors Vitamin AExplanation / Answer
52.a.
With age,collegen synthesis decreases.
53.c.
osteocytes(bone forming cells)are present in lacunae of bones.
54.a.
At birth, all bone marrow is red.
With age, more and more of it is converted to the yellow type.
Adults have on average about 2.6kg (5.7lbs) of bone marrow, with about half of it being red.
Red marrow is found mainly in the flat bones such as hip bone, breast bone, skull, ribs, vertebrae and shoulder blades, and in the cancellous ("spongy") material at the proximal ends of the long bones femur and humerus.
55.a.Vit C(ascorbic acid)
Vitamin C (VitC) plays a critical role in the maintenance of a normal mature collagen network in humans (anti-scurvy properties) by preventing the auto-inactivation of lysyl and prolyl hyroxylase, two key enzymes in collagen biosynthesis.
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