Lab 7

Question 1

The number of occurrences of a repeating event per unit time

Answer 1

Frequency

Question 2

Height of the wave from baseline to crest

Answer 2

Amplitude

Question 3

The shape and form of a signal

Answer 3

Waveform

Question 4

The length from the crest of one peal to the crest of the next peak

Answer 4

Wavelength

Question 5

3 Muscle Tissue Types

Answer 5

Skeletal, smooth, & cardiac

Question 6

Which muscle tissue type makes up about 40% of the cell mass of the body?

Answer 6

Skeletal Muscle

Question 7

Each muscle os made up of individual _______ organized in fascicles.

Answer 7

muscle fibers (muscle cells)

Question 8

Loss of muscle functioning as a consequence of strokes damaging neurons in the brain

Answer 8

upper motor neuron lesions

Answer 9

Excitability

Answer 10

Contractility

Answer 11

Extensibility

Answer 12

Elasticity

Question 13

An entire muscle will not only have muscle fibers, but also … within it

Answer 13

nerves, blood vessels, and connective tissue

Question 14

Tendons

Answer 14

connective tissues that attach muscle to bone

Question 15

Muscle attachments can be direct or indirect. T or F?

Answer 15

True

Question 16

If the periosteum or perichondrium is fused w/ the muscle’s epimysium, then this is a _______ attachment.

Answer 16

Direct attachment

Question 17

_________ attachments are more durable, smaller, and are more common.

Answer 17

Indirect attachments

Question 18

A tendon or ____________ is an example of an indirect attachment.

Answer 18

aponeurosis

Question 19

Two or more muscles usually work ______________.

Answer 19

antagonistically

Question 20

In this arrangement, as one muscle contracts and shortens, its antagonist relaxes and elongates.

Answer 20

antagonistically

Question 21

The ___________ is the plasma membrane of a muscle fiber

Answer 21

sarcolemma

Question 22

__________ is the cytoplasm of a muscle fiber.

Answer 22

sarcoplasm

Question 23

Muscle cells contain lots of _____________, which stores oxygen and glycosomes.

Answer 23

myoglobin

Question 24

granules of glycogen that can be broken down to supply ATP from glucose for energy

Answer 24

Glycosomes

Question 25

Most of the intracellular volume of skeletal muscle cells is taken up by organelles called ___________, which are repeating units of sarcomeres.

Answer 25

myofibrils

Question 26

The smallest “atomic” contractile units of skeletal muscle fibers.

Answer 26

sarcomeres

Question 27

Skeletal muscle is striated because the dark _______ bands and light ________ within the sarcomeres are perfectly lined besides one another.

Answer 27

A bands; I bands

Question 28

Each A band has a middle region that is slightly light called the ___________

Answer 28

H zone (or H band)

Question 29

The I band has a dark midline region termed the ________.

Answer 29

Z line (or Z disc)

Question 30

The __________ runs from Z line to Z line.

Answer 30

sarcomere

Question 31

The thick filaments contain the protein _________ and run the length of the A band

Answer 31

myosin

Question 32

Each thick filament can contain over ______ myosin molecules

Answer 32

300

Question 33

When a muscle contracts, the globular myosin heads link the thick and thin filaments together making ____________, and swivel as motors to create force that shortens the sarcomere.

Answer 33

cross bridges

Question 34

Elastic filaments are made of the protein ________

Answer 34

titin

Question 35

The thin filament consists of a helix of two actin subunit strands plus the proteins _________ and _____________.

Answer 35

tropomyosin; troponin

Question 36

Cross bridge formation where myosin-binding site is blocked

Answer 36

Relaxed

Question 37

Cross bridge formation where myosin-binding site is exposed

Answer 37

During contraction

Question 38

A myosin head, in its high-energy configuration, binds to an exposed myosin-binding site on the actin filament.

Answer 38

Binding

Question 39

ADP and inorganic phosphate are released from the myosin head, returning it to its low-energy stake, resulting in a power stroke.

Answer 39

Power Stroke

Question 40

ATP binds to the myosin head, causing detachment

Answer 40

Detaching

Answer 41

Cocking