Exam 3- Functions of Bone

Question 1

Support

Answer 1

Form the framework of the body, contrivute to the shape, alignment, and positioning of the body

Question 2

Protection

Answer 2

enclose delicate organs (ribs, skull)

Question 3

Movement

Answer 3

Bones connected at joints by ligaments, connected to muscled by tendons. Bones and joints act as levers that move when muscles contract (ex. deltoid, humerus)
bone cells can’t move, bones are involved with movement muscles

Question 4

Mineral Storage

Answer 4

Major reservoir for Ca, P, and others

works opposite blood to maintain blood mineral homeostasis (Ca++)

Question 5

Hematopoiesis

Answer 5

Blood cell formation is carried out by myeloid tissue (red bone marrow)

Question 6

Blood Calcium Levels

Answer 6

Skeleton has 98% of body’s Ca++ reserves
maintains homeostasis of blood ca++ levels
during bone formation osteoblasts remove Ca++ from blood, during break down, osteroclasts release Ca++ into blood

Question 7

Homeostasis of Ca++ concentration essential for:

Answer 7

Bone Formation
Blood Clotting
Nervous Transmission
Muscle Contraction

Question 8

Parathyroid hormone

Answer 8

Produced by parathyroid gland. Primary regulator; Stimulates osteoclasts, increases renal absorption of Ca++. stimulates vit. D synthesis

Question 9

Calcitonin

Answer 9

Secondary Regulator. Produced by thyroid gland, stimulates osteroblasts, inhibits osteoclasts, increases bone regularity.

Question 10

Functions of Bone

Answer 10

Support, protection, movement, mineral storage, hematopoiesis