Bios 252 Actual Exam Questions And Correct Answers Complete Study Guide

BIOS 252 ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS COMPLETE STUDY
GUIDE

●● Cardiac Muscle
Answer: striated, involuntary, intercalated discs, uninucleated


●● Smooth Muscle
Answer: non-striated, involuntary, no intercalated discs, uninucleated


●● 4 major functions of muscles
Answer: produce body movement, stabilize positions, store and move
substances, generate heat


●● 4 properties of muscles
Answer: electrical excitability, contractility, extensibility, elasticity


●● Electrical Excitability
Answer: ability to respond to a stimulus and convert it to an action
potential


●● Contractility

,Answer: ability to shorten


●● Extensibility
Answer: ability to stretch without tearing to a certain degree


●● Elasticity
Answer: ability to return to resting length after contracting or stretching


●● Organization of Skeletal Muscle from largest to smallest
Answer: skeletal muscle, fascicle, muscle fiber, myofibril, microfilament


●● Organization of Skeletal Muscle from smallest to largest
Answer: microfilament, myofibril, muscle fiber, fascicle, skeletal muscle


●● Sarcomere
Answer: contractile unit of a muscle fiber


●● sarcolemma
Answer: plasma membrane of a muscle fiber


●● sarcoplasmic reticulum

, Answer: specialized endoplasmic reticulum of muscle cells that stores
calcium


●● z-disc
Answer: coin-shaped sheet of proteins that anchors the thin filaments
and connects myofibrils to one another


●● m-line
Answer: middle of sarcomere


●● a band
Answer: dark area; extends length of the thick filaments (myosin)


●● i band
Answer: light area; thin myofilaments only (z disc is center of i band)


●● zone of overlap
Answer: the densest, darkest area on a light micrograph
where thick and thin filaments overlap


●● thick filament
Answer: myosin