Human Anatomy & Physiology Chapter 9: Muscles & Muscle Tissue

Match the following description with the correct type of muscle: Striated and involuntary

Cardiac muscle

Match the following description with the appropriate type of muscle: Subject to conscious control

Skeletal muscle

Match the following skeletal muscle structure with the correct description: Perimysium

Surrounds each muscle bundle (fascicle)

Match the following description to the muscle type: Visceral, one nucleus per cell, and nonstriated

Smooth muscle

Match the following description with the correct type of muscle: Striated and voluntary

Skeletal muscle

Match the following skeletal muscle structure with the correct description: Epimysium

Surrounds an entire muscle

Match the following description with the correct type of muscle: Nonstriated, involuntary, found in the walls of hollow visceral organs

Smooth muscle

Which of the following muscles is voluntary

The muscle that extends the arm at the elbow

Which of the following characteristics is unique to smooth muscle?

Absence of striations

Which of the following muscle types is both voluntary and striated?

Skeletal muscle only

Select the characteristic of muscle tissue that sets it apart from all other tissue types

Contractility

Match the following description to the appropriate type of muscle: Not subject to voluntary control, is nonstriated, and contractions are slow and sustained

Smooth muscle

The layer of dense irregular connective tissue that surrounds the entire skeletal muscle is the __________.

epimysium

Match the following skeletal muscle structure with the correct description: Endomysium

Surrounds each muscle fiber

Match the following cellular component of a skeletal muscle fiber with its description: Cytoplasm of a skeletal muscle fiber

Sarcoplasm

Match the following cellular component of a skeletal muscle fiber with its description: Plasma membrane of skeletal muscle fiber

Sarcolemma

Myofibrils are composed of repeating contractile elements called __________.

sarcomeres

The linking of thick and thin filaments together is called __________.

Forming a cross bridge

Identify the part of thick or thin filaments in skeletal muscle indicated by “A”

Por

Identify the part of thick or thin filaments in skeletal muscle indicated by “D”

Actin subunits

The functional unit of contraction in a skeletal muscle fiber is the __________.

sarcomere

In the sliding filament model of contraction, which of the following does not occur when the muscle cell shortens?

H zones appear

Match the following muscle chemical with the correct name: Oxygen storage molecule in skeletal muscle

myoglobin

Which of the following provides the final “go signal” for contraction?

Calcium ions

Match the following cellular component of a skeletal muscle fiber with its description: Rodlike contractile element within a muscle fiber containing myofilaments

myofibril

Match the following component of a muscle fiber with its description: Area of the sarcomere with overlapping thick and thin filaments

A band

A sarcomere is part of a(n) __________.

Myofibril

Which of the following are inward invaginations of the sarcolemma that run deep into the cell between the terminal cisterns?

T tubules

In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and __________.

Myosin

"Cross bridges" that link between the thick and thin filaments directly involve __________.

Myosin

Which of the following is a special adaptation present in skeletal muscle cells but absent in most other cells?

Muscle ceels have myoglobin; most other cells do not

In the sliding filament model of contraction, which of the following occurs when the muscle cell shortens?

The distance between successive Z discs shortens

Match the following component of a muscle fiber with its description: Area of a sarcomere containing only thin filaments

I band

Match the following component of a muscle fiber with its description: Area in the center of the A band containing only thick filaments

H zone

Identify the step in the phases leading to muscle fiber contraction indicated by “C”

Local depolarization (end plate potential) ignites AP in sarcolemma

Which of the following occurs when calcium binds to troponin?

Tropomyosin shifts, exposing the binding sites on actin

Match the following chemical with its function: Ca²⁺

Released by terminal cisternae into the sarcoplasm to bind with troponin

Identify the step in the phases leading to muscle fiber contraction indicated by “A”

ACh released; binds to receptors on sarcolemma

Match the following term with the correct description: End plate potential

Depolarization occuring only at the neuromuscular junction

Identify the step in the phases leading to muscle fiber contraction indicated by “E”

SR releases Ca²⁺; Ca²⁺ binds to troponin; myosin-binding sites (active sites) on actin exposed

The space between the axon terminal of the motor neuron and the muscle fiber is called the __________.

Synaptic cleft

Acetylcholinesterase __________.

Breaks down acetylcholine

Match the following term with the correct description: Refractory period

The time when a fiber cannot be stimulated until repolarization is complete

Match the following term with the correct description: Repolarization

Restoration of the membrane potential to resting potential

Match the following area with the correct term: Contains vesicles filled with acetylcholine

Axon terminal

Identify the step of the cross-bridge cycle in skeletal muscle indicated by “A”

Cross bridge formation

Which of the following is an autoimmune disease that destroys acetylcholine receptors?

Myasthenia gravis

What term is used to describe the region where a somatic motor neuron meets with a skeletal muscle fiber?

Neuromuscular junction