What are the two muscles used to raise your eyebrows?
epicranius frontalis and occipitalis
a wavelike motion; consists of alternate contractions and relaxations of the longitudinal and circular muscles; helping to force the contents of a tube along its length
What is the recording of muscle contraction called?
The irises of the eyes are an example of what?
a multi-unit smooth muscle
What causes rigor mortis to happen?
results in an increase in membrane permeability to calcium ions, which promotes cross-bridge attachment, and a decrease in availability of ATP in the muscle fibers, which prevents cross-bridge release from actin…thus, the actin and myosin filaments of the muscle fibers remains linked until the muscles begin to decompose
What three (3) muscles extend the leg at the knee?
rectus femoris, vastus lateralis, vastus medialis
Neurons release what chemicals in order to communicate with the cells that they control?
Drugs called what are used to treat irregular heart rhythms?
calcium channel blockers
do it by blocking ion channels that admit extracellular calcium into cardiac muscle cells
What is a sarcomere?
the structural and functional unit of a myofibril
What do liver cells turn lactic acid into?
What is a connective tissue covering that is associated with muscle forming and is broad, shaped like fibrous sheet, that attaches muscles to other muscles called?
What is the origin and insertion of the Teres minor?
origin: scapula / insertion: humerus
What is the type of contraction that results in shortening of a muscle?
concentric, shortening contraction / an isotonic contraction
What is the cell membrane of a muscle cell called?
What is the difference between the origin and the insertion?
the origin is the unmovable end and the insertion is the movable end
What are two things that cause smooth muscle to contract?
acetylcholine (ACh) & norepinephrine (NE)
What is cordlike part that attaches a muscle to a bone?
What does lactic acid accumulation result in?
it results in oxygen debt
What is the enzyme that removes acetylcholine (ACh) from the synapse?
acetylcholinesterase…(rapidly decomposes ACh in the synapse; this enzyme present in the synapse and on
the membrane of the motor end plate, prevent a single nerve impulse from continuously stimulating a muscle fiber)
Toss up question!
When a person walk with a constant waddle it called what?
gluteal gait…(when the gluteus medius and minimus are paralyzed)
What is the action of the buccinator?
compresses cheeks (blowing)
What are the two major types of smooth muscle fibers?
visceral smooth muscle and multi-unit smooth muscle
Smooth muscle fibers lack troponin, what protein do they have?
calmodulin…(binds to calcium ions released when its fibers are stimulated, activating contraction)
The assistant to the prime mover is called what?
True or False: Troponin is a muscle protein who's
chemical activity cause the contraction of muscle fibers?
False: Troponin is a protein which acts to block the contraction of the sarcomere
What is one of the first sign of Parkinson's disease?
What muscle am I contracting when I put my chin to my chest?
What is the function of intercalated discs?
help cells join, helping transmit the force of contraction from cell to cell; also allow ions to diffuse between cells, allowing muscle impulse to travel rapidly from cell to cell
True or False: Fascicles, Muscles, Thick and thin filaments, Muscle fibers (cells), Myofibrils. Is this the correct order?