Comes from mesenchymal cells (endothelium and mesothelium)
Name the three types of epithelia-
Lining, Glandular and Specific
Simple, stratified and pseudostratified are all examples of what kind of epithelia?
Lining epithelia
Define endothelium:
Simple squamous epithelium that lines the heart cavities, blood vessels and lymph vessels
Define Mesothelium:
Simple squamous epithelium that lines the three serous body cavities (pleural, peritoneal, and pericardial) and covers organs located in these cavities.
What is the name for highly specialized epithelium and what is it's function?
Transitional- to stretch Ex: Urinary bladder
What makes up the H band in skeletal muscle tissue?
Thick, myosin filaments
What makes up the I band in skeletal muscle tissue?
Thin, actin filaments
What is the A band made up of?
Actin and myosin filaments (thick and thin)
What is the Z line?
It bisects the I band in skeletal muscle. It is used to orient the A filaments
What is the M line?
It bisects the H band in skeletal muscle
Give examples of true and functional syncytium:
True= skeletal muscle, Funtional= Cardiac muscle (communicating through gap junctions)
What surrounds a muscle fiber?
Endomysium
What surrounds a fasicle?
Perimysium
What surrounds a muscle?
Epimysium
What resides between two Z lines?
Sarcoplasmic Reticulum
Where is a triad found and what is it consisted of?
Found in skeletal muscle and consists of twoterminal cistern and one t-tubule
Define terminal cisternae:
expanded ends of sarcoplasmic reticulum
Where is a diad and what is it made of?
A diad is found in Cardiac Muscle and consists of smooth endoplasmic reticulum and one t-tubule
Name the 6 events in the contraction sequence of a muscle:
1. AP causes release of CA2+ at motor end plate
2. Depolarization of sarcolemma
3. Sarcoplasmic reticulum releases Ca2+
4. Ca2+ binds TnC
5. Myosin heads bind to Actin
6. Racheting occurs to contract the muscle (Z-lines come closer together)