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The muscle action potential will cause the sarcoplasmic reticulum to release calcium ions when stimulated directly by the


A) sarcolemma.
B) neuromuscular junction.
C) tropomyosin.
D) axon terminal.
E) T tubule.

F) A) and B)
G) A) and C)

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A muscle cramp happens when the actin and myosin filaments "seize up".

A) True
B) False

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Describe the six characteristics used to name skeletal muscles.

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1.Size of the muscle is used to help nam...

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In young persons who are still developing,what is the band of cartilage called that remains between the primary ossification center and each secondary ossification center?


A) chondrocytic mediastinum
B) osteoclastic border
C) osteon promoter
D) fontanel
E) growth plate

F) B) and E)
G) C) and D)

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In the movies,there are often scenes where someone is holding a person to prevent them from falling.All of a sudden,the person's grip gives way and the other person falls.What is this most likely due to?


A) The person changes their mind and lets go.
B) Fatigue, following sustained muscle contraction, is apparent when a muscle relaxes even though stimulation continues.
C) A muscle twitch has a contraction period followed by a relaxation period.
D) Some of the muscle fibers contract while others relax at any given time. When more muscle fibers relax than contract, the grip would be broken.
E) The slow-twitch muscle fibers take over after the fast-twitch muscle fibers fail. These do not have the same strength and endurance as the fast-twitch fibers and the person lets go.

F) C) and D)
G) None of the above

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Timothy has really "ripped" abdominal muscles.What muscle(s) has he exercised extensively to get that appearance?


A) rectus abdominis
B) biceps brachii
C) latissimus dorsi
D) external oblique
E) adductor longus

F) C) and D)
G) A) and D)

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A neuromuscular junction operates much like a synapse between two nerve cells.

A) True
B) False

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The patella is primarily held in place by tendons that attach it to the


A) femur.
B) fibula.
C) tibia.
D) calcaneus.
E) tarsal bones.

F) A) and B)
G) A) and C)

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Muscles that are not used or used for very weak contractions experience hypertrophy.

A) True
B) False

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The humerus bone in Figure 19.1 is the bone labeled


A) a.
B) b.
C) c.
D) d.
E) e.

F) A) and B)
G) C) and E)

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What is the order you would encounter these tissues entering the outside of the end of a long bone of the arm?


A) articular cartilage \rarr spongy bone \rarr marrow \rarr periosteum
B) articular cartilage \rarr periosteum \rarr spongy bone \rarr marrow
C) periosteum \rarr articular cartilage \rarr spongy bone \rarr marrow
D) articular cartilage \rarr marrow \rarr spongy bone \rarr periosteum
E) spongy bone \rarr articular cartilage \rarr periosteum \rarr marrow

F) B) and D)
G) A) and B)

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Which of the following can prevent osteoporosis?


A) aspirin therapy
B) estrogen replacement therapy
C) treatment with chondroitin sulfate
D) treatment with glucosamine
E) treatment with corticosteroids

F) C) and E)
G) A) and C)

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Which is NOT a correct association of facial bones?


A) zygomatic bones-bridge of the nose
B) mandible-lower jaw
C) maxillae-upper jaw and hard palate
D) temporal-temples
E) frontal-forehead

F) A) and B)
G) B) and C)

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What is the condition in many older women in which the bones become weak and thin?


A) rheumatoid arthritis
B) bursitis
C) osteoarthritis
D) osteoporosis
E) meningitis

F) D) and E)
G) A) and B)

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The deltoid muscle is shaped like a triangle.

A) True
B) False

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Actin and myosin filaments are both present in the dense region called the


A) A band.
B) Z line.
C) H zone.
D) I band.
E) M band.

F) C) and D)
G) D) and E)

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Depending on the degree of stimulation,more and more individual muscle fibers contract resulting in a stronger muscle contraction.

A) True
B) False

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Which bone is the only bone in the body that does not articulate with another bone?


A) zygomatic bone
B) mandible
C) floating rib
D) hyoid bone
E) wrist bone

F) B) and D)
G) D) and E)

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The joints found between the vertebrae are classified as being


A) immovable.
B) slightly movable.
C) freely movable.
D) synovial joints.
E) discoidal.

F) A) and C)
G) C) and D)

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Which part of a muscle twitch occurs when the sarcomere distance is decreasing?


A) latent period
B) contraction period
C) relaxation period
D) refractory period
E) expansion period

F) A) and B)
G) C) and D)

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