Chapter 9 - Smooth Muscle

Created by gima86 

Upgrade to
remove ads

14 terms

peristalsis

The alternating contraction and relaxation of these opposing layers mixes substances in the lumen and squeezes them through the organ's internal pathway

Varicosities

The numerous bulbous swelling sof the nervous system in conjunction with the smooth muscle

Diffuse Junction

Junctions where the varicosities release neurotranmitter into a wide synaptic cleft in the general area of the smooth muscle cell

Caveolae

Pouchlike infoldings that sequester bits of extracellular fluid containing a high concentration of Ca2+ close to the membrane

Dense Bodies

Places where at regular intervals to cytoplasmic structures, smooth muscle fibers contain a lattice like arrangement of not contractile intermediate filaments that resist tension

Calmodulin

A cytoplasmic calcium binding protein, it is a regulatory molecule

myosin kinase

A kinase enzyme that phosphorylates the myosin, activating it.

nerves, hormones, local chemical changes

What are the three factors of smooth muscle regulation?

stretch, length and tension change, hyperplasia

What are the three special characteristics of smooth muscle?

Stress Relaxation Response

It allows a hollow organ to fill or expand slowly to accommodate a greater volume without promoting strong contractions that would expel its contens

Hyperplasia

When muscle fibers can divide to increase their numbers

Single unit smooth muscle

Smooth muscle found in the walls of all hollow organs except the heart.

Multiunit Smooth Muscle

Smooth muscle found in the large airways to the lungs and in large arteries, the arrector pili muscles, internal eye muscles

Myoblasts

immature muscle cells, form muscle cells

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

NEW! Voice Recording

Click the mic to start.

Create Set