Exam # 3 Chapter 12

Front 1

The light bands in skeletal muscle are composed of ______ and the dark bands are composed of _____.

Back 1

actin, myosin

Front 2

The release of this substance from the sarcoplasmic reticulum causes the filaments within the sarcomeres to slide past one another.

Back 2

calcium

Front 3

_________ is a protein that winds about an actin filament covering the binding sites for myosin

Back 3

Tropomyosin

Front 4

The quickest method of providing ATP for muscle activity is:

Back 4

creatine phosphate conversion

Front 5

Another name for amyotrophic lateral sclerosis is _____________.

Back 5

Lou Gehrig's Disease

Front 6

When calcium ions are released from the sarcoplasmic reticulum, they combine with the protein _________.

Back 6

troponin

Front 7

A CSI agent finds a body in which rigor mortis has ceased. She concludes that the person has been dead for over ____ hours.

Back 7

24

Front 8

The smooth endoplasmic reticulum that is involved in the storage of calcium is known as the:

Back 8

sarcoplasmic reticula

Front 9

The contractile elements inside muscle cells are grouped into structures called:

Back 9

myofibrils

Front 10

The striations observed in skeletal and cardiac muscles are produced by:

Back 10

alternating A bands and I bands

Front 11

The functions of the skeletal muscles include:

supporting the body and protecting internal organs
providing movement and stabilizing joints
maintaining a constant body temperature
assisting movement in the cardiovascular and lymphatic systems
all of the above responses are correct

Back 11

all of the above

Front 12

Many insecticides and chemical weapons are effective because they contain an enzyme called acetylcholinesterase that inhibits the neurotransmitter called ________.

Back 12

acetylcholine

Front 13

A muscle fiber contains many contractile portions called _____ that run the length of a muscle fiber.

Back 13

myofibrils

Front 14

According to the sliding filament theory, myosin filaments pull actin filaments by means of _________.

Back 14

cross-bridges

Front 15

The basic muscle tissues found in humans include

smooth muscle
cardiac muscle
skeletal muscle
All of the choices are correct

Back 15

all of the choices are correct

Front 16

According to the sliding filament theory, a sarcomere

Back 16

gets shorter when it contracts

Front 17

Identify the incorrect statement.

Cardiac muscle is found in the heart.
Smooth muscle can be found in the muscles of the arm.
Skeletal muscle can be found in the arms and legs.
Smooth muscle lines blood vessels.
All of the statements are correct.

Back 17

Smooth muscle can be found in the muscles of the arm

Front 18

When Laura looked at the steak she noticed components of the muscle that she learned in her anatomy class called _______

Back 18

Fascicles

Front 19

The contractile unit of a muscle fiber is called a:

Back 19

sarcomere

Front 20

In a muscle fiber, the sarcolemma forms the _______.

Back 20

T tubules

Front 21

The sarcomere extends between two dark lines called the ________ lines

Back 21

Z

Front 22

_________ is a neurotransmitter that triggers muscle contraction

Back 22

Acetylcholine

Front 23

Michelle was receiving Botox injections for her wrinkles. Botox works by ___.

Back 23

preventing release of ACH

Front 24

The gangster movies call a dead person a stiff, rigor mortis is the proper name. How does this occur?

Back 24

Without ATP, muscles remain fixed in their last state of contraction