Flashcards in Test 3 Deck (148)
What are the two cells of nervous tissue?
neurons and glia
Which cranial nerve controls the Lateral Ptyregoid?
V. Trigeminal Nerve
What is another name for a neuron's cell body?
What is another name for chromatophilic substance?
Membranous organelles located in neuronal cell bodies and dendrites. Rough endoplasmic reticulum making peptide chains. It is not found in either axons or the axon hillock
Lower Motor Neurons are located where?
Brainstem and Spinal Cord
Which neurotransmitter does lower motor neurons use to communicate with the muscles?
How many pairs of spinal nerves are their?
Autoimmune disease that decreases cholinergic receptors. Acetylcholine is inhibited to help with this disease.
stiffening of the body after death, contraction of the muscles.
-Glia of CNS found in high density in white matter
Ventricle that contains Cerebral Spinal Fluid in center of spinal cord
Stores and sequesters calcium ions in muscle cells; smooth endoplasmic reticulum
Smooth muscle contraction of tubular internal organs; digestive tract
-Region of sarcomere with only actin present
-they shorten when sarcomere contracts
-held by direct attachments to structures called Z lines
Nodes of Ranvier
Unmyelinated regions of axons
Protein located in grooves of actin that blocks myosin attachment
-They connect to actin and pull actin toward the center, which contracts the sarcomere
-Loaded with ATP
Sliding filament hypothesis
the contraction of sarcomeres; theory of muscle contraction
proteins(thick & dark) that, with actin, forms the filaments that interact to contract muscle fibers
Protein in a muscle fiber that forms the thin filaments(light) that slide between filaments of the protein myosin, shortening the muscle fibers.
the striations form a repeating pater of units along the muscle fiber
the second part of the striation pattern, which composes thick myosin filaments overlapping thin actin filaments
-an enzyme found in myosin heads
-it catalyzes the breakdown ATP to ADP and a phosphate
-rod-shaped and occupy the longitudinal grooves of the actin helix
-Prevents myosin cross bridges from binding/attaching to actin
-High affinity for calcium
-attached to actin
Basic process of muscle contraction
Calcium is attached to troponin causing it to change shape and push tropomyosin out of the actin helix. With the removal of tropomyosin the myosin cross bridges can now attach to the actin, which causes the sarcomere to contract
cross bridges have to be loaded with ATP, which allows the cross bridges to disconnect from the actin.
Region where the actin and myosin filaments overlap