Chapter 23

Instructions

Choose your answers from a-d by clicking the radio button next to each choice and then press 'Submit' to get your score.

Regarding the physiology of bone:

a) As boys are taller on average, the adolescent growth spurt occurs earlier in boys than in girls.

b) The adolescent growth spurt is absent in pituitary dwarfism.

c) Long bones increase in length by intramembranous ossification.

d) Bone mass starts to fall after puberty.

Further questions regarding the physiology of bone:

a) Osteoblasts are responsible for bone remodeling in response to stress.

b) Dividing cartilage cells are situated in the marrow cavity of long bones.

c) The organic matrix of bone is secreted by chondroblasts.

d) Most bones are formed by endochondral ossification of a hyaline cartilage model.

Regarding the hormonal control of growth:

a) Bone growth during fetal life is controlled primarily by growth hormone.

b) Parathyroid hormone is required for normal activity of the osteoclasts.

c) The sex steroids are chiefly responsible for closure of the epiphyses.

d) Growth hormone secretion is stimulated by IGF-I.

Regarding the repair of damaged tissues:

a) Nervous tissue regenerates significantly following damage.

b) Oncogenes protect normal cells from transformation into cancer cells.

c) Cells from a malignant neoplasm are well differentiated cells.

d) The liver responds to loss of tissue by regeneration.