Essentials of Anatomy and Physiology

SARCOLEMMA—POLARIZATION When a muscle fiber is relaxed, the sarcolemma is polarized (has a resting potential), which refers to a ...

B Bundles of muscle cells Muscle cells (fibers) Myofibril Fascia and connective tissue Myofibrils C Muscle fiber Sarcomere Z lin ...

sium pumpreturns them inside. Both of these pumps are active transport mechanisms, which, you may recall, require ATP. Muscle fi ...

CONTRACTION—THE SLIDING FILAMENT MECHANISM All of the parts of a muscle fiber and the electrical changes described earlier are i ...

(cerebrovascular accident) occurs in the frontal lobes of the cerebrum. Without nerve impulses, skele- tal muscles become paraly ...

BOX7–3 MUSCULAR DYSTROPHY Muscular dystrophyis really a group of genetic diseases in which muscle tissue is replaced by fibrous ...

of stairs, hurry to catch a bus, or just go dancing, you might reflect a moment on all of the things that are actually happening ...

150 The Muscular System MUSCLES OF THE HEAD AND NECK Three general groups of muscles are found in the head and neck: those that ...

The Muscular System 151 MUSCLES OF THE TRUNK The muscles of the trunk cannot be described with one or two general functions. Som ...

152 Brachioradialis Biceps brachii Brachialis Triceps brachii Latissimus dorsi External oblique Gluteus medius Gluteus maximus V ...

B Pectineus Masseter Sternocleidomastoid Deltoid Pectoralis major Brachialis Biceps brachii Brachioradialis Gastrocnemius Tibial ...

154 Levator labii superioris Zygomaticus Orbicularis oris Mentalis Platysma Anterior—left lateral view Orbicularis oculi Tempora ...

155 Table 7–4 MUSCLES OF THE TRUNK Muscle Function Origin Insertion Trapezius External intercostals Internal intercostals Diaphr ...

156 The Muscular System Deltoid Biceps Brachialis Extensor carpi radialis longus Extensor carpi radialis longus Brachioradialis ...

The Muscular System 157 Table 7–5 MUSCLES OF THE SHOULDER AND ARM Muscle Function Origin Insertion Deltoid Pectoralis major Lati ...

158 Sartorius Rectus femoris Vastus lateralis Peroneus longus Tibialis anterior Extensor digitorum brevis Extensor digitorum lon ...

The Muscular System 159 Clitoris Urethra Vagina Ischium Central tendon Anus Gluteus maximus Anococcygeal ligament Coccyx Ischioc ...

tion of variable numbers of muscle fibers in a muscle. Tendons attach muscles to bone; the origin is the more stationary bone, ...

Name the organ systems directly involved in movement, and for each state how they are involved. (p. 138) State the function of ...

In an accident with farm machinery, Mr. R. had his left arm severed just below the elbow. Mrs. R. stopped the bleeding, called ...