BIOS 255 Comprehensive Exam 2 Questions and
Answers | 2026 Update | 100% Correct.
Define positive feedback
A self-amplifying cycle that leads to greater change in the same direction
Define negative feedback
A process in which the body senses a change and activates mechanisms that negate or reverse it
What is epithelial tissue?
a sheet of cells that covers a body surface or lines a body cavity
Is epithelial tissue vascular or avascular?
avascular (it contains no blood vessels)
why is epithelial tissue polar?
These cells are polarized and form extensive cell-cell adhesions, including adherens junctions
and tight junctions, with each other
epithelial tissue role in regeneration
capable of rapidly replacing damaged and dead cells.
types of protein fibers in connective tissue
collagen fibers, reticular fibers, elastic fibers
what is chondroitin sulfate and where is it located?
, provides support and adhesiveness in cartilage, bone, skin, and blood vessels
most commonly found in cartilage
what is the function of keratin?
Prevents underlying structures from drying out
What is a merocrine gland?
glands that release fluids by exocytosis
what are the functions of merocrine glands
thermoregulation, secretion, protection
What is a sebaceous gland?
a small gland in the skin which secretes a lubricating oily matter (sebum)
function of sebaceous glands
produce sebum (oil) into the hair follicles to lubricate the skin and hair.
What are apocrine glands?
glands that secrete fluid
function of apocrine glands
produce sweat in response to emotional stress, heat & sexual activity
what are osteoclasts
large cells that resorb or break down bone matrix
function of osteoclasts
Answers | 2026 Update | 100% Correct.
Define positive feedback
A self-amplifying cycle that leads to greater change in the same direction
Define negative feedback
A process in which the body senses a change and activates mechanisms that negate or reverse it
What is epithelial tissue?
a sheet of cells that covers a body surface or lines a body cavity
Is epithelial tissue vascular or avascular?
avascular (it contains no blood vessels)
why is epithelial tissue polar?
These cells are polarized and form extensive cell-cell adhesions, including adherens junctions
and tight junctions, with each other
epithelial tissue role in regeneration
capable of rapidly replacing damaged and dead cells.
types of protein fibers in connective tissue
collagen fibers, reticular fibers, elastic fibers
what is chondroitin sulfate and where is it located?
, provides support and adhesiveness in cartilage, bone, skin, and blood vessels
most commonly found in cartilage
what is the function of keratin?
Prevents underlying structures from drying out
What is a merocrine gland?
glands that release fluids by exocytosis
what are the functions of merocrine glands
thermoregulation, secretion, protection
What is a sebaceous gland?
a small gland in the skin which secretes a lubricating oily matter (sebum)
function of sebaceous glands
produce sebum (oil) into the hair follicles to lubricate the skin and hair.
What are apocrine glands?
glands that secrete fluid
function of apocrine glands
produce sweat in response to emotional stress, heat & sexual activity
what are osteoclasts
large cells that resorb or break down bone matrix
function of osteoclasts
