Which is the main inorganic component of the bones?
ক
Type-I collagen fibres
খ
Calcium carbonate
গ
Calcium phosphate
ঘ
Calcium fluoride
সঠিক উত্তর: গ
Calcium phosphate
উত্তর
সঠিক উত্তর: গ
Calcium phosphate
গ
৮.
The Howship's lacunae contain-
ক
Osteoprogenitor cells
খ
Osteoclasts
গ
Osteoblasts
ঘ
Osteocytes
সঠিক উত্তর: খ
Osteoclasts
উত্তর
সঠিক উত্তর: খ
Osteoclasts
খ
৯.
Osteocytes are found in
ক
ক) Lacunae
খ
খ) Lamellae
গ
গ) Canaliculi
ঘ
ঘ) Matrix
সঠিক উত্তর: ক
ক) Lacunae
উত্তর
সঠিক উত্তর: ক
ক) Lacunae
ক
ব্যাখ্যা
Osteocytes (Gr. osteon, bone + kytos, cell), which are found in cavities (lacunae) between bone matrix layers (lamellae), with cytoplasmic processes in small canaliculi (L. canalis, canal) that extend into the matrix
১০.
Bone remodelling cell
ক
ক) Osteoprogenitor
খ
খ) Osteoblast
গ
গ) Osteocytes
ঘ
ঘ) Osteoclast
সঠিক উত্তর: ঘ
ঘ) Osteoclast
উত্তর
সঠিক উত্তর: ঘ
ঘ) Osteoclast
ঘ
ব্যাখ্যা
Osteoclast helps in bone remodelling by bone resorption activity.
১১.
What is the “cribriform plate”?
ক
ক) That part of the nose with three folds of tissue called conchae.
খ
খ) The structure that separates the nose from the nasopharynx.
গ
গ) Part of the ethmoid bone through which olfactory nerves pass.
ঘ
ঘ) The nose structure through which air is warmed and humidifi ed as it passes.
সঠিক উত্তর: গ
গ) Part of the ethmoid bone through which olfactory nerves pass.
উত্তর
সঠিক উত্তর: গ
গ) Part of the ethmoid bone through which olfactory nerves pass.
গ
ব্যাখ্যা
The cribriform plate of the ethmoid bone has many foramina through which pass olfactory nerves that transmit sensory information from inhaled air to the olfactory bulbs.
১২.
Most abundant constituent of bone matrix
ক
ক) Bicarbonate
খ
খ) Citrate
গ
গ) Magnesium
ঘ
ঘ) Calcium hydroxyapatite
সঠিক উত্তর: ঘ
ঘ) Calcium hydroxyapatite
উত্তর
সঠিক উত্তর: ঘ
ঘ) Calcium hydroxyapatite
ঘ
ব্যাখ্যা
About 50% of the dry weight of bone matrix is inorganic materials. Calcium hydroxyapatite is most abundant, but bicarbonate, citrate, magnesium, potassium, and sodium ions are also found. Significant quantities of noncrystalline calcium phosphate are also present. The surface of hydroxyapatite crystals is hydrated, facilitating the exchange of ions between the mineral and body fluids.