09.06 Epithelial and connective tissue

Question 1

Answer 1

one type of leukocytes that contribute to acute and chronic inflammatory responses. have pink cytoplasm

Question 1

Answer 1

a. Mostly dense collagen fibers that resists stress from all directions.
b. Very little ground substance or cells.
c. Fibroblasts are most abundant cells in this type

Question 1

Answer 1

• Responsible for the synthesis of organic components of the bone matrix, such as collagen, glycoproteins and proteoglycans.
• Located in the bone surface

Question 2

Answer 2

• Also contains tyep II collagen but abundant elastic fibers
• Located in the pinna of the ear, the internal and external auditory tubes, the epiglottis, and the larynx.
• Somewhat yellow due to elastic fibers
• Chondrocytes are large and abundant and there is less ECM.

Question 3

Answer 3

partly surround the endothelial cells of blood vessels

Question 4

Answer 4

• Contains type II collagen and found in the respiratory passages, the end of ribs and joints and at the epiphyseal plates
• Has blue-grey apperaence due to the ECM it secretes
• Only type of cartilage that can undergo degeneration (which hurts the joints, leading to joint replacement surgery)

Question 5

Answer 5

• These cells are responsible for bone resorption (break-down) when the body needs calcium.

Question 6

Answer 6

i. Plasma cells: terminally differentiated B lymphocytes that produce and secrete antibodies

Question 8

Answer 8

mast cells are derived from the bone marrow. Have granules with mediators such as histamine, prostaglandins, and leukotrienes

Question 9

Answer 9

one type of leukocytes that contribute to acute and chronic inflammatory responses

Question 9

Answer 9

• Secondary or mature bone
• Replaces woven bone in most sites
• Haversian canals are seen
 Series of concentric lamellae seen in lamellar bone
 They can transverse the length of the bone
 A blood vessel is positioned in the center which supplies nutrients to the osteocytes within the lacunae of the canals

Question 10

Answer 10

a. Multilocular (multiple droplets per cell)
b. Very vascular
c. Plentiful in infants and seen in much smaller amounts in adults
d. Contains thermogenin (a heat releasing protein)

Question 11

Answer 11

embryonic connective tissue is very loose with jelly-like matrix.

Wharton’s jelly: only found in the umbilical cord.

Question 12

Answer 12

Collagen Fiber possess great tensile strength. Each fiber consists of tropocollagen molecules which are composed of 3 α chains wrapped around each other in helical formation

Question 13

Answer 13

• Primary or immature bone
• First to form during fetal development or repair
• Has abundant osteocytes and irregular collagen

Question 14

Answer 14

a. Formed primarily of elastic tissue with very little collagen.
b. Fibroblasts are seen.

Question 16

Answer 16

aka areolar connective tissue OR lamina propria in mucosa.

Has abundant ground substance with loosely woven collagen and elastic fibers.

Question 17

Answer 17

• Contains dense type I collagen in its matrix, allowing it to withstand strong tensile forces
• Found in the intervertebral disks, in the pubic symphysis of the pelvis, and attached to bone
• There is no perichondrium and there is very little ECM.
• Chondrocytes of fibrocartilage are derived from fibroblasts that differentiate later.

Question 19

Answer 19

i. Type III collagen is the major component
ii. Fibers form meshlike networks interspersed with fibroblasts and macrophages
iii. Forms architectural network of liver sinusoids, adipose tissue, bone marrow, lymph nodes, spleen, smooth muscle and the islets of Langerhans (pancreas)

Question 20

Answer 20

• Mature bone cells that are housed in the lacunae of the bone.
• Secrete substances necessary for bone maintenance

Question 21

Answer 21

a. Coarse collagen bundles oriented into parallel sheets that resist tissue forces

Question 22

Answer 22

white adipose tissue is unilocular (a single lipid droplet per cell). the tissue is very vascular.