Biology Flashcards
Mast cells are found in
the repertory and gastrointestinal tracts
mast cells release
histamines
mast cells release - in response to -
histamines in response to allergic rxn, infection, or injury
histamines case an increase in
blood flow to affected areas
adipose and melanocytes are both examples of
connective tissue
dendrites transport info - the cell body
towards
axons transport info - the cell body
away from
membrane potential steps of typical action potential
- stimulus
- depolarization
- repolarization
- hyperpolarization
- refractory period
glial cells in CNS
oligodendrocytes
glial cells in PNS
Schwann cells
node of ravier
gap in myelin, region where ions can pass across plasma membrane, contains high density of Na+ channels
saltatory conduction
nerve impulse movement from one node to the next on an axon
ACh
excitatory neurotransmitter present at neuromuscular junctions
muscle fibers are
multinucleated
Be able to draw sarcomere
drawing - place A band, H zone and Z lines actin and myosin
without ATP, muscles remain in
rigor state
actin is composed of
2 helically would rows of spherical protein subunits
tropomyosin
resides in the actin groove on skeletal muscle, covering the myosin binding sites, preventing attachment
troponin interacts with
tropomyosin, acting and Ca2+ - when Ca2+ binds, it causes the tropomyosin to shift, exposing mysoin head binding site on actin
each myofibril is surrounded by
sarcoplasmic reticulum
T tube
follows the Z line of each myofibril, action potential travels down it to stimulate Ca2+ release from the SR
motor unit
motor neuron + muscle fiber
motor neuron has its
cell body in the CNS and axon in skeletal muscle
3 brain divisions
- forebrain
- midbrain
- hind brain
