Hondros Bio 254 Exam 2 With 100% Correct And Verified Answers
Question 1: Function of Osteoclasts
CORRECT ANSWER : Chew up bone, secretes an acidic
substance that dissolves "chews" up bones
Question 2: Three layers of muscle
CORRECT ANSWER : Epimysium, Perimysium,
Endomysium
Question 3: Fascicle
CORRECT ANSWER : bundle of muscle fibers
Question 4: myofibril is made up of
CORRECT ANSWER : myofilaments
Question 5: Myofilaments
CORRECT ANSWER : The contractile proteins, Actin and
Myosin, of muscle cells
Question 6: Origin
CORRECT ANSWER : Attachment of a muscle that remains
relatively fixed during muscular contraction
Question 7: Insertion
CORRECT ANSWER : Point of attachment that moves
when the muscle contracts
Question 8: Prime Mover
CORRECT ANSWER : The muscle that acts as the initial
and main source of motive power.
Question 9: Antagonist
CORRECT ANSWER : Performs the opposite of action
Question 10: Lever system components
CORRECT ANSWER : Lever, Effort, Load
Question 11: Muscles
CORRECT ANSWER : Moves skeleton & Substances. Heat
Production
Question 12: Posture
CORRECT ANSWER : Are always contracting, unless we
are lying down.
Question 13: Characteristics of Skeletal of Muscle cells
CORRECT ANSWER : Excitability, Contractility,
Extensibility
Question 14: Excitability (irritability)
CORRECT ANSWER : Ability to be stimulated
Question 15: Contractility
CORRECT ANSWER : Ability to contract, or shorten &
produce body movement
Question 16: Extensibility
CORRECT ANSWER : Ability to extend, or stretch, thereby
allowing muscles to return to the their resting place length
Question 17: Sarcolemma
CORRECT ANSWER : Plasma membrane of the muscle
fibers
Question 18: Where does excitation of muscle occur?
CORRECT ANSWER : NMJ (neuromuscular junction)
Question 19: Excitation of Muscle part 1
CORRECT ANSWER : In response to a Action Potential
(AP) a motor neuron releases Acetylcholine. The Acetylcholine crosses the synaptic cleft and binds to receptors on the plasma lemma.
Question 20: Excitation of Muscle part 2
CORRECT ANSWER : The AP triggers the release of
Calcium from the Sarcoplasmic Reticulum (SR), which in