A&P 1 Lab Exam 3

Name one ACTION of the sternocleidomastoid muscle

flexes neck, rotates head

Name one ACTION of the pectoralis major muscle.

flexes arm, medially rotates arm

Name one ACTION of the external oblique muscle.

stabilizes pelvis

Name one ACTION of the masseter muscle.

closes jaw

flexor carpi radialis

Identify the indicated muscle. (c)

flexor carpi ulnaris

Identify the indicated muscle. (e)

external carpi radialis longus

Identify the indicated muscle

coracobrachialis

Identify the indicated muscle

bicep brachii

Identify the indicated muscle

pectoralis major

Identify the indicated muscle

pectoralis minor

Identify the indicated muscle

external intercostal

Identify the indicated muscle

transversus abdominis

Identify the indicated muscle

fascicle

Identify the indicated structure.

a single muscle contraction is called?

a twitch

If a muscle contracts against a load that is too heavy for the muscle to lift, what type of contraction is the muscle demonstrating?

isometric contraction

If we increase the frequence of stimulation of a muscle untill we acheive a steady sustained contraction, we will have caused what phenomenon?

tetanus

What do we call the period of time between the application of a stimulus to a muscle and the first observable response or movement of the muscle?

latent period

Name one ORIGIN of the masseter muscle.

maxilla

Name one ORIGIN of the buccinator muscle.

maxilla, mandible

Name one ORIGIN of the deltoid muscle.

clavicle

Name one ORIGIN of the infraspinatus muscle.

infraspinous fossa of scapula

Name one INSERTION of the gastrocnemius muscle.

calcaneus

Name one INSERTION of the pectoralis major muscle

intertubercular groove of humerus

Name one INSERTION of the rectus abdominis muscle

xiphoid process

Name one INSERTION of the rectus femoris muscle

patella

What do we call muscles that are primarily responsible for producing a specific movement?

agonist (prime movers)

temporalis

Identify the indicated muscle.

levator labii superioris

Identify the indicated muscle.

zygomaticus major

Identify the indicated muscle.

platysma

Identify the indicated muscle.

sternocleidomastoid

Identify the indicated muscle.

mylohyoid

Identify the indicated muscle.

semimembranosus

Identify the indicated muscle.

bicep femoris

What are the individual contractile units of a muscle cell called?

sarcomeres

Define "insertion" as it applies to skeletal muscles

movable attachment site of a muscle

Define "origin" as it applies to skeletal muscles

fix or immovable

a band

Identify the indicated region of the sarcomere.

i band

Identify the indicated region of the sarcomere.

triad

Identify the indicated structure.

vastus lateralis

Identify the indicated muscle.

gracilis

Identify the indicated muscle.

soleus

Identify the indicated muscle.

fibularis longus (peroneus)

Identify the indicated muscle.

tibialis anterior

Identify the indicated muscle.

infraspinatus

Identify the indicated muscle.

supraspinatus

Identify the indicated muscle.

rhomboid major

Identify the indicated muscle.

smooth

identify muscle tissue

• If we stimulate a muscle, and then stimulate

it again immediately after it has been

allowed to relax, we observe that the

second contraction of the muscle is slightly

greater than the first. What do we call this

phenomenon?

treppe

• If a muscle contracts against a load that it is

able to lift, what type of contraction is the

muscle demonstrating?

isoTONIC

• Name one action of the semimembanosus

muscle.

extend thigh rotate leg

orbicularis oculi

mentalis