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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
What are the 7 functions of the muscular system?	MOVEMENT OF BODY MAINTENANCE OF POSTURE PRODUCTION OF BODY HEAT RESPIRATION COMMUNICATION CONSTRICTION OF ORGANS AND VESSELS CONTRACTION OF THE HEART
What constitute approximately 40% of the body? also called striated muscle	SKELETAL MUSCLE
What is the ability of the muscle to shorten with force?	CONTRACTIBILITY
What is thecapacity of the muscle to respond to a stimulus?	EXCITABILITY
What is the ability to be stretched to their normal resting length?	EXTENSIBILITY
What is the ability to recoil to their original resting length?	ELASTICITY
What is a connective tissue sheath that surrounds a skeletal muscle?	EPIMYSIUM/MUSCULAR FASCIA
What is a numerous visible bundles that make up the muscle?	MUSCLE FASCICULI
What is a loose connective tissue that surrounds the muscle fasciculi?	PERIMYSIUM
What are several muscle cells that composes a fasciculus?	MUSCLE FIBERS
What is a loose connective tissue that surrounds a muscle fiber?	ENDOMYSIUM
What is the cell membrane of a muscle fiber?	SARCOLEMMA
What is a tube-like invaginations w/c occur at regular intervals along the muscle fiber?	T-TUBULES
What is a highly organized smooth E.R.; has a relatively high concentration of Ca2+ (muscle contraction)?	SARCOPLASMIC RETICULUM
What is the cytoplasm of a muscle fiber?	SARCOPLASM
What is threadlike structure composed of actin and myosin myofilament?	MYOFIBRILS
What is a thin filament (purple)?	ACTIN MYOFILAMENTS
What is a thick filament (green)?	MYOSIN MYOFILAMENTS
What is a highly ordered, repeating units of actin + myosin myofilaments; joined end to end to form the myofibril?	SARCOMERE
What is the binding sites for Ca2+; attached at specific intervals along the actin myofilaments?	TROPONIN MOLECULES
What covers the attachment sites on the actin myofilaments; located along the grove bet. the twisted strands of actin myofilaments?	TROPOMYOSIN FILAMENTS
What resembles a golf club heads? can bind to attachment sites bend and straighten breakdown ATP	MYOSIN HEADS
What is the basic structural and functional unit of skeletal muscle?	SARCOMERE
What is a network of protein fibers forming an attachment site for actin myofilaments?	Z DISK
What consists of actin myofilaments; spans each Z disk?	I BAND
What is a darker, central region that extends the length of the myosin of myofilaments	A BAND
What is a second light zone that consists of myosin myofilaments?	H ZONE
What is a dark-staining bands?	M LINE
The arrangement of the actin and myosin filaments in sacromeres gives the myofibrils a ________________________appearance.	Banded
The alternating I bands and A bands of the sacromeres are responsible for the ____________ in the skeletal muscle fibers.	STRIATIONS
Cell membranes have a negative charge on the inside relative to a positive charge outside; occurs because there is an uneven distribution of ions.	RESTING MEMBRANE POTENTIAL
What are the two types of ion channels?	NONGATED/LEAK CHANNELS (ALWAYS OPEN) CHEMICALLY GATED CHANNELS