BIOL 2404 Chapter 7 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
Skeletal Muscle - 🧠ANSWER ✔✔- Attached to bones of skeleton
- Under conscious control (voluntary)
- Striated
- Movement and posture
- Generate heat for the body
- Keeps blood moving through veins and lymphatics
Epimysium - 🧠ANSWER ✔✔Surrounds whole muscle---> fascia to tendons
Perimysium - 🧠ANSWER ✔✔Surrounds fascicles within a muscle
,Endomysium - 🧠ANSWER ✔✔Surrounds muscle fibers (cells) within a
fascicle.
Muscle Fiber - 🧠ANSWER ✔✔Muscle Cell
Sarcolemma - 🧠ANSWER ✔✔Cell membrane of a muscle fiber
Sarcoplasm - 🧠ANSWER ✔✔Cytoplasm of a muscle cell (fiber)
Myofilaments - 🧠ANSWER ✔✔The contractile proteins, actin and myosin, of
muscle cells
Thick Filaments - 🧠ANSWER ✔✔Composed of myosin protein; heads form
cross-bridges; Ca++ binds here.
Thin Filaments - 🧠ANSWER ✔✔Composed of actin protein; associated with
troponin and tropomyosin, which prevent crossbridge formation when
muscle is not contracting
Myofibrils - 🧠ANSWER ✔✔Bundles of myofilaments
- Thin actin filaments
- Thick myosin filaments
, Sarcoplasmic Reticulum (SR) - 🧠ANSWER ✔✔Endoplasmic Reticulum
(ER)
Triad - 🧠ANSWER ✔✔1 T-tubule and 2 terminal cisternae
Sarcomere - 🧠ANSWER ✔✔Contractile unit of muscle
I Band - 🧠ANSWER ✔✔Light band, composed of thin actin filaments
A Band - 🧠ANSWER ✔✔Dark band, composed of thick myosin filaments
overlapping with thin actin filaments
H Zone - 🧠ANSWER ✔✔Center of A band; composed of thick myosin
filaments
Z line - 🧠ANSWER ✔✔Anchors filaments in place; sarcomere boundary
M line - 🧠ANSWER ✔✔Anchors thick filaments; center of A band
Skeletal Muscle Contraction - 🧠ANSWER ✔✔Results from the actin and
myosin filaments sliding past one another, shortening the sarcomeres
Neuromuscular Junction - 🧠ANSWER ✔✔- Site where an axon of motor
neuron and skeletal fiber interact
- Skeletal muscle fibers contract only when stimulated by a motor neuron
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
Questions and Verified Answers |
Already Graded A+
Skeletal Muscle - 🧠ANSWER ✔✔- Attached to bones of skeleton
- Under conscious control (voluntary)
- Striated
- Movement and posture
- Generate heat for the body
- Keeps blood moving through veins and lymphatics
Epimysium - 🧠ANSWER ✔✔Surrounds whole muscle---> fascia to tendons
Perimysium - 🧠ANSWER ✔✔Surrounds fascicles within a muscle
,Endomysium - 🧠ANSWER ✔✔Surrounds muscle fibers (cells) within a
fascicle.
Muscle Fiber - 🧠ANSWER ✔✔Muscle Cell
Sarcolemma - 🧠ANSWER ✔✔Cell membrane of a muscle fiber
Sarcoplasm - 🧠ANSWER ✔✔Cytoplasm of a muscle cell (fiber)
Myofilaments - 🧠ANSWER ✔✔The contractile proteins, actin and myosin, of
muscle cells
Thick Filaments - 🧠ANSWER ✔✔Composed of myosin protein; heads form
cross-bridges; Ca++ binds here.
Thin Filaments - 🧠ANSWER ✔✔Composed of actin protein; associated with
troponin and tropomyosin, which prevent crossbridge formation when
muscle is not contracting
Myofibrils - 🧠ANSWER ✔✔Bundles of myofilaments
- Thin actin filaments
- Thick myosin filaments
, Sarcoplasmic Reticulum (SR) - 🧠ANSWER ✔✔Endoplasmic Reticulum
(ER)
Triad - 🧠ANSWER ✔✔1 T-tubule and 2 terminal cisternae
Sarcomere - 🧠ANSWER ✔✔Contractile unit of muscle
I Band - 🧠ANSWER ✔✔Light band, composed of thin actin filaments
A Band - 🧠ANSWER ✔✔Dark band, composed of thick myosin filaments
overlapping with thin actin filaments
H Zone - 🧠ANSWER ✔✔Center of A band; composed of thick myosin
filaments
Z line - 🧠ANSWER ✔✔Anchors filaments in place; sarcomere boundary
M line - 🧠ANSWER ✔✔Anchors thick filaments; center of A band
Skeletal Muscle Contraction - 🧠ANSWER ✔✔Results from the actin and
myosin filaments sliding past one another, shortening the sarcomeres
Neuromuscular Junction - 🧠ANSWER ✔✔- Site where an axon of motor
neuron and skeletal fiber interact
- Skeletal muscle fibers contract only when stimulated by a motor neuron
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
