Connective, Cardiac, and Nervous tissues Flashcards
8 functions of connective tissue
hold everything together, strengthen with framework, protection, transport, fat storage, produce blood, and help in tissue repair, and protection from foreign invaders
4 general characteristics of connective tissue
cells surrounded by ECM, usually capable of cell division, variable blood supply, variable consistency
3 types of cells in connective tissue
fibroblasts, macrophages, and mast cells
2 functions of fibroblasts
produce fibers and can make repairs (ex: scar tissue)
example of a macrophage
WBC
macrophage function
mobile scavengers important for defense
mast cell function
release heparin and histamine, large cells
types of fiber produced by fibroblasts
elastic, collagenous, and reticular
5 properties of collagenous fibers
major structural component, composed of collagen, somewhat flexible, not elastic (won’t bounce back), and high tensile strength
2 examples of structures containing collagenous fibers
tendons and ligaments
6 properties of elastic fibers
composed of elastin, weak, very elastic, very stretchable, able to bounce back to original shape, low tensile strength
2 examples of structures containing elastic fibers
vocal cords and air passages
why are elastic fibers important to vocal cords?
it allows them to constantly stretch and relax
why are elastic fibers important to air passages?
it allows them to dilate and constrict to affect air flow
2 properties of reticular fibers
thin collagenous fibers, provides support network and framework to some organs
example of an organ that has a base structure made of reticular fibers
spleen
3 types of connective tissues
dense, loose, and specialized
3 types of dense tissue
regular, irregular, and elastic
3 types of loose tissue
areolar, adipose, and reticular
5 types of specialized tissue
bone, cartilage, blood, muscle, and nervous
ground substance =
ECM
areolar tissue is composed of
fibroblasts in ground substance with loosely packed collagen and elastic fibers
sites of areolar tissue
beneath epithelial layers, and some membranes (ex: basement mb)
component of adipose tissue
fibroblast-like cells that store fat in cytoplasm
what does and doesn’t increase when fat store increases?
size of cells not number
4 locations of adipose tissue
abdomen, heart, bone marrow, eye socket
4 functions of adipose tissue
protection, cushion, energy storage, insulation
example of adipose acting as protection
adipose tissue in the abdomen to protect the heart and lungs
example of adipose acting as a cushion
found in eye-sockets to cushion eyes
how does adipose insulate the body
by preserving heat
property of reticular tissue
thin network of reticular fibers in 3D
function of reticular tissue
provides framework for some internal organs (ex: spleen)
3 types of dense connective tissue
regular, irregular, and elastic
components of regular dense connective tissue
densely packed collagen fibers with some elastic fibers, and some fibroblasts
pro of regular dense connective tissue
strong
con of regular dense connective tissue
has less blood supply
2 examples of structures made of regular dense connective tissue
tendons and ligaments
components of irregular dense connective tissue
very unorganized fibers, collagen fibers, and fibroblasts
1 example of a structure composed of irregular dense connective tissue
dermis
3 components of elastic dense connective tissue
elastic fibers with some collagen and fibroblasts
2 examples of structures composed of elastic dense connective tissue
large vessels (like aorta), and airways
large vessels and airways contain elastic dense connective tissue since
they need to be able to expand, change shape, and dilate blood vessels that then can bounce back to position
5 types of specialized connective tissue
cartilage, blood, bone, muscle, and nervous
property of cartilage tissue
rigid collagenous fibers
what structure surrounds cartilage tissue
the perichondrium
what does the perichondrium supply to the cartilage tissue
an inefficient amount of blood
how does blood from the perichondrium get into cartilage tissue
through diffusion
the cells within cartilage tissue divide ___ and the tissue heals ___
slowly, poorly
4 functions of cartilage tissue
protection, support, attachment, and bone modeling
what type of cell forms cartilage tissue
chondrocytes
where are chondrocytes embedded into
the matrix
what are the two types of cartilage
elastic and hyaline
where is hyaline cartilage located?
at the ends of ribs
where is elastic cartilage located?
makes up the external portion of the ears
which type of cartilage tissue is more flexible?
elastic cartilage
why is elastic cartilage more flexible than hyaline cartilage
because it contains more elastic fibers
name of the space where chondrocytes are housed
lacuna
6 properties of bone tissue
most rigid tissue, formed by osteoblasts, composed of calcium and phosphorus, provides support and protection, salt storage, and bone marrow forms blood cells
when osteoblasts surround themselves in matrix, they become
osteocytes
what makes up blood’s ECM
plasma
what type of cells are found in blood
RBC, WBC, and fragments of platelets
3 substances that blood transports
to transport hormones, nutrients, and waste products
2 properties of muscle tissue
contractile, contains muscle fibers
contractile property means that muscles
can contract and only move in one direction
when a muscle contracts the muscle fibers
shorten and thicken
3 types of muscle tissue
skeletal, smooth, and cardiac
4 properties of skeletal muscle tissue
attach to bones, have striations, are under voluntary control, and each cell contains more than one nucleus
striations
perpendicular lines that run through muscle fibers and designate sarcomeres
4 smooth muscle tissue properties
no striations, surrounds hollow internal organs, involuntary movement, and each cell contains only one nucleus
4 cardiac muscle properties
only found in the heart, have some striations, cells are branches and connected, moves involuntary
what 2 types of intercellular junctions are found in cardiac tissue?
gap junctions and desmosomes
3 nervous tissue locations
brain, spinal cord, peripheral nerves
basic cell of nervous tissue
neuron
type of intercellular junction found in nervous tissue
gap junctions
nervous tissue function
sends signals to rapidly deliver info and determines responses