Question

Human Anatomy & Physiology-Assignment 4

Chapter 11

1. A muscle fiber is ________.

A) a muscle cell

B) a rod-like structure consisting of sarcomeres placed end to end

C) an arrangement of actin and myosin filaments deep within a muscle cell

D) the elaborate arrangement of smooth endoplasmic reticulum inside a muscle cell

2. What is the correct order of structures as you move from outside a muscle cell, to deep inside it?

A) myofibril, myofilament, fiber

B) myofilament, fiber, myofibril

C) myofilament, myofibril, fiber

D) fiber, myofibril, myofilament

3. The actual contractile units of muscles extend from Z disc to Z disc. They are ________.

A) myofibrils

B) sarcomeres

C) sarcoplasmic reticulum

D) thick filaments

4. This contractile protein forms the thin filaments.

A) actin

B) dystrophin

C) myosin

D) titin

5. The dark band of skeletal muscle consists of ________.

A) only thin filaments

B) T tubules

C) only thick filaments

D) both thick and thin filaments

6. This indentation of the sarcolemma carries electrical signals deep into the muscle cells.

A) sarcoplasmic reticulum

B) T tubule

C) terminal cisterns

D) triad

7. Each of the elements that make up a skeletal muscle is surrounded by connective tissue. Which words below correctly pair the connective tissue layer with the corresponding muscle structure?

A) entire muscle: epimysium

B) fascicle: perimysium

C) functional group of muscles: endomysium

D) muscle fiber: deep fascia

8. This strong, cord-like structure attaches muscles to bones.

A) deep fascia

B) ligament

C) tendon

D) myofibril

9. The space between the axon terminal and the sarcolemma of a muscle fiber is called the ________.

A) aponeurosis cleft

B) muscle gap

C) nerve gap

D) synaptic cleft

10. A neuron and all the muscle fibers it stimulates is called a ________.

A) fascicle

B) motor unit

C) myoneural junction

D) synaptic cleft

Answer 1

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