BIOS 255 Comprehensive Exam
Which is the best example of a mechanism that contains a positive feedback loop?
blood clotting
What surrounds a synovial joint, encloses synovial cavity, & unites the articulating bones?
articular capsule
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The ________ component of connective tissue is found between the cells and fibers & binds
cells.
ground substance
Consisting of 5 fused sacral vertebrae
sacrum
Layer of dead skin filled with sacs of keratin
stratum corneum
What are the types of connective tissue fibers?
collagen, reticular, elastic
Where do you find apocrine sweat glands?
, armpits, groin, areola
Which bones contribute to the hard palate?
maxilla and palatine
What do osteoclasts do?
dissolve bone
a sarcomere is
the contractile unit between two Z lines
What is the first step in muscle contraction?
motor neuron sends nerve impulses to the muscle
Depolarization of the action potential is due to
influx of Na+
Complete (fused) tetanus is described as
continuous contraction without any relaxation
Which hamstring muscle is this?
biceps femoris
How many sodium and potassium ions does the sodium-potassium pump bring in and out of the
cell membrane?
3 potassium ions in and 2 sodium ions out
local potential is graded
amount of stimulation determines how much sodium enters the cell
in order to trigger an action potential, graded potential must reach the
axon hillock
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