smooth muscle DSA - karius

Question 1

only input to skeletal muscle, ONLY site where we may inhibit,

Answer 1

alpha-motorneuron
via nAchR
can shut it down partially/ completely

Question 2

every crossbridge cycle in skeletal muscle consumes

Answer 2

ONE atp molecule

Question 3

skeletal muscles energy substrates

Answer 3

FFA (at low levels of work)
glucose (at high levels of work)
Creatinine phosphate (RESERVE)
capable of anaerobic as well

Question 4

types of smooth muscle

Answer 4

• multi-unit

- unitary/ single-unit smooth muscle

Question 5

multi unit smooth muscle examples

Answer 5

ciliary muscle of the eye, the iris muscle of the eye, and the
piloerector muscles that cause erection of the hairs when stimulated by the sympathetic nervous
system.

Question 6

unitary smooth muscle found in

Answer 6

visceral smooth muscle!
- the walls of most viscera of the body,
including the gastrointestinal tract, bile ducts, ureters, uterus, and many blood vessels.

Question 7

intracellular Ca++ increase in smooth muscle can be caused by

Answer 7

in different types of smooth muscle
by nerve stimulation of the smooth muscle fiber, hormonal stimulation, stretch of the fiber, or even
change in the chemical environment of the fiber

Question 8

latent period

Answer 8

time required for rapid diffusion of Ca++ from ECF (10-3 molar) to inside of cell (10-7 molar)
- avg. 300-300 ms (50x greater vs. skeletal muscle)