Figure 140

Striated (Skeletal) Muscle Fibers (Longitudinal Section) Each light (I) band has a dark (Z) line through it. Each dark (A) band has a light (H) zone through it. (X250)

Histology

Cardiac Muscle Longitudinal Section

Figure 1-41

Cardiac Muscle (Longitudinal Section)

Striated muscle fibers branch and anastomose at junctions marked by dark intercalated disks. (X250)

Nucleus

Intercalated disk

Figure 1-41

Cardiac Muscle (Longitudinal Section)

Striated muscle fibers branch and anastomose at junctions marked by dark intercalated disks. (X250)

Nucleus

Intercalated disk

Terminal Bulb Muscle Fiber

Figure 1-42

Smooth Muscle (Longitudinal Section)

Canoe- or spindle-shaped muscle cells lack striations, and each has a single, elongated nucleus. (X250)

^ Smooth muscle cell

Nucleus

Figure 1-42

Smooth Muscle (Longitudinal Section)

Canoe- or spindle-shaped muscle cells lack striations, and each has a single, elongated nucleus. (X250)

^ Smooth muscle cell

Nucleus

Smooth Muscle Contraction

Figure 1-43

Innervation of Skeletal Muscle: Motor Endplate Branching nerve bundle terminates to form the myoneural junctions. Nerve terminals release small quantities of chemical neurotransmitter to stimulate muscle contraction.

Terminal branches of motor neuron Synaptic bulb Skeletal muscle fibers

Myoneural junction

Figure 1-43

Innervation of Skeletal Muscle: Motor Endplate Branching nerve bundle terminates to form the myoneural junctions. Nerve terminals release small quantities of chemical neurotransmitter to stimulate muscle contraction.

Terminal branches of motor neuron Synaptic bulb Skeletal muscle fibers

Myoneural junction

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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