Muscle tissue

Question 1

Answer 1

Smooth muscle (HE)
(1) Characteristic
① Lack in striation
A. Because NO myofibrils arranged in strict patterns
(A) Rather, irregular arrangement
② Composed of Muscle cells (myocyte)
A. Have single nucleus
(A) Elongated shape / spindle shape (tapered at both ends)
a. agglomerate of fusiform cells
B. each muscle cell (fiber) group in branching bundles
(A) do not run parallel, but consist in irregular arrangement system
a. contract
③ Found in walls of Visceral organs
④ Involuntary movement
A. Ex: contraction of arteries
B. Weak & Slow contraction

Question 2

Answer 2

Skeletal muscle (cross section, HE)
Skeletal Muscle
1. Skeletal Muscle
(1) Characteristic
① Striated Muscle
(A) has myofibrils
a. composed of myofilaments
I. organized in many sarcomere
(I) give striped shape
(II) actin & myosin are arranged in sarcomere
(III) contractile unit
① Composed of Muscle fibers (myofiber)
B. is referred as cylindrical muscle cell
(A) which is basic histological & functional unit
(B) can increase in SIZE NOT Number
(C) Multiple Nuclei in single muscle fiber
a. By Fusion of mono nucleic
b. Fibers are large & elongated
② Attached to bones by tendons
③ Voluntary movements
A. Quick contraction

Question 3

Answer 3

Skeletal muscle (longitudinal , HE)
Skeletal Muscle
1. Skeletal Muscle
(1) Characteristic
① Striated Muscle
(A) has myofibrils
a. composed of myofilaments
I. organized in many sarcomere
(I) give striped shape
(II) actin & myosin are arranged in sarcomere
(III) contractile unit
① Composed of Muscle fibers (myofiber)
B. is referred as cylindrical muscle cell
(A) which is basic histological & functional unit
(B) can increase in SIZE NOT Number
(C) Multiple Nuclei in single muscle fiber
a. By Fusion of mono nucleic
b. Fibers are large & elongated
② Attached to bones by tendons
③ Voluntary movements
A. Quick contraction

Question 4

Answer 4

Cardiac muscle (HE)
Cardiac Muscle
1. Cardiac Muscle
(1) Characteristic
① Striated Muscle
(A) has myofibrils
a. composed of myofilaments
I. organized in many sarcomere
(I) give striped shape
(II) actin & myosin are arranged in sarcomere
(III) contractile unit
② Involuntary movement
(2) Composed of
① Network of Cardiac Muscle Cells/Fibers (cardiomyocyte)
② Basic Histological unit
A. single (central) nucleus
B. Connected by intercalated discs (Eberth’s line) (Gap junction → make dark
transverse line)
(A) enable the rapid transmission of electrical impulses through the network
② Syncytium (Multinucleated)
A. Basic functional unit
B. act in a coordinated contraction of the myocardium
③ Elongated & branched cell
A. Each cell: 1~2 centrally located nuclei
B. Oval shaped cell
④ Purkinje fibers
A. Specialized cardiac muscle cell
(A) Conduct electrical signals to heart contraction

Question 5

Answer 5

Cardiac muscle (Iron hematoxylin)
Cardiac Muscle
1. Cardiac Muscle
(1) Characteristic
① Striated Muscle
(A) has myofibrils
a. composed of myofilaments
I. organized in many sarcomere
(I) give striped shape
(II) actin & myosin are arranged in sarcomere
(III) contractile unit
② Involuntary movement
(2) Composed of
① Network of Cardiac Muscle Cells/Fibers (cardiomyocyte)
② Basic Histological unit
A. single (central) nucleus
B. Connected by intercalated discs (Eberth’s line) (Gap junction → make dark
transverse line)
(A) enable the rapid transmission of electrical impulses through the network
② Syncytium (Multinucleated)
A. Basic functional unit
B. act in a coordinated contraction of the myocardium
③ Elongated & branched cell
A. Each cell: 1~2 centrally located nuclei
B. Oval shaped cell
④ Purkinje fibers
A. Specialized cardiac muscle cell
(A) Conduct electrical signals to heart contraction