Skeletal System

Parathyroid hormone

________ (PTH) increases rate, so more calcitriol formed.

Stimulates kidneys

________ to increase the loss of calcium in the urine.

Osteoids

________ and osteoblasts mix together to form the surface of the bone.

Absorbs shock

________ in moveable joints: cushions the force of the bones coming together.

knees

For ________: there is a synovial cavity that contains synovial fluid (which allowed shock absorption and lubes the bones.

Reduces Friction

________: allows bones to move against each other.

Synthesize

________ and secrete semisolid organic bone matrix called osteoid.

Promotes

Inhibits osteoclast activity, thus less calcium is released into the blood (________ deposition of Ca2+ into bones)

UV

________ light converts 7- dehydrocholesterol to vitamin D3 (cholecalciferol)

hormone

Stimulates the liver to produce the ________, somatomedin.

Vitamin D3

________ circulates throughout the body.

Stimulate osteoblasts

________ and increase the rate of cartilage growth and bone formation in the epiphyseal plate.

Osteoid

________ contains collagen, glycoproteins, etc.

Vertebral disc

Ex: ________ are joints that allow the spine to move.

calcitriol

Only ________ increases the absorption of calcium from the small intestine into the blood.

Hematopoiesis

________: formation of blood cells.

Calcification

________ occurs, deposition of hydroxyapatite.

PTH

________ will digest our bones to raise calcium levels.

Hydroxyapatite

________ hardens the matrix and accounts for the strength and rigidity of bones.

Tendons

________: connects muscle to bone.

calcium levels

Aids in regulating blood ________.

Ligaments

________: connects bone to bone.

Vitamin D

________- enhances calcium absorption from the GI tract.

Vitamin C

________- is required for collagen formation.

Bone matrix

________ is destroyed by substance released from osteoclasts.

parathyroid glands

Secreted and released by ________ in response to reduced blood calcium levels.