Current(A3) A&P Lab 1 Exam 3

Identify the type of muscle tissue shown?

smooth

Identify the indicated region of the sarcomere

A-band

Identify the indicated region of the sarcomere

Z-disc

List two of the seven criteria listed in your lab manual that are used to name muscles?

location and shape

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

Sarcomeres

Identify the indicated structure

t-tubule

Identify the indicated layer of connective tissue

endomysium

The connective tissue sheath that forms around an entire skeletal muscle is called:

epimysium

The light segments of the striations of a skeletal muscle cell are called:

I-band

A flat, sheet-like bundle of connective tissue that connects a muscle to another muscle or to a bone is called:

aponeurosis

What do we call muscles that aid the action of other muscles by reducing undesirable or unnecessary movement?

synergists

Which of the seven criteria used for naming a muscle applies to the brachioradialis muscle?

location of origin and insertion

Which of the seven criteria used for naming a muscle applies to the trapezius muscle?

shape

A neuron and all of the muscle cells that it stimulates are together called a: 

motor unit

The three phases of a muscle twitch are the contraction period, the relaxation period, and the:

latent period

The three phases of a muscle twitch are the latent period, the relaxation period, and the:

contraction period

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 action of the external oblique muscle

flexion and rotation of vertebral column

Name one action of the orbicularis oculi muscle

close the eyelids

Name one action of the buccinator muscle

compresses the cheeks

Name one action of the zygomaticus major muscle

 

elevation of the lateral corners of the mouth

Name one insertion of the triceps brachii muscle

 

olecranon of ulna

Name one insertion of the extensor digitorum muscle

 

distal phalanges of fingers 2-5

Name one insertion of the semimembranosus muscle

 

medial condyle of the tibia

Name one insertion of the zygomaticus major muscle

 

skin and muscle at the corner of the mouth

Name one origin of the buccinator muscle

 

maxillary bone

Name one origin of the zygomaticus major muscle

 

zygomatic bone

Name one origin of the semitendinosus muscle

 

ischial tuberosity

Name one origin of the flexor carpi radialis muscle

 

medial epicondyle of the humerus

Identify the indicated muscle

internal oblique abdominal

Identify the indicated structure

linea alba

Identify the indicated muscle

zygomaticus minor

Identify the indicated muscle

orbicularis oris

Identify the indicated muscle

orbicularis occuli

Identify the indicated muscle

masseter

Identify the indicated muscle

stylohyoid

Identify the indicated muscle

mylohyoid

Identify the indicated muscle

deltoid

Identify the indicated muscle

pectoralis major

Identify the indicated muscle

serratus anterior

Identify the indicated muscle

teres minor

Identify the indicated muscle

supraspinatus

Identify the indicated muscle

latissimus dorsi

Identify the indicated muscle

extensor carpi ulnaris

Identify the indicated muscle

extensor carpi radialis longus

Identify the indicated muscle

flexor carpi radialis

Identify the indicated muscle

rectus femoris

Identify the indicated muscle

psoas major

Identify the indicated muscle

peroneus

Identify the indicated muscle

semitendinosus

Identify the type of muscle tissue shown?

cardiac

What neurotransmitter do motor neurons use to stimulate muscle cells?

acetylcholine

Identify the indicated region of the sarcomere

thin filaments

Identify the indicated region of the sarcomere.

h-zone

Identify the indicated structure

triad

Identify the indicated layer of connective tissue

perimysium

Skeletal muscles cells are called:

muscle fibers

The branches at the end of an axon of a motor neuron are called:

axonal terminals

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

agonists

Which of the seven criteria used for naming a muscle applies to the biceps femoris muscle?

number of origins and location

Which of the seven criteria used for naming a muscle applies to the transversus abdominis muscle?

direction of fibers and location

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

tetany

What type of force is produced by the elastic recoil of a stretched muscle?

passive

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

What type of force is produced by the physiological contraction of a muscle rather than by elastic recoil?

active

Name one action of the triceps brachii muscle

 

extension of the forearm at the elbow

Name one action of the gracilis muscle

 

adduction of thigh at the hip

Name one action of the zygomaticus minor muscle

 

elevation of the lateral corners of the mouth

Name one insertion of the tibialis anterior muscle

 

medial cuneiform bone

Name one insertion of the gastrocnemius muscle.

calcaneus

Name one insertion of the gracilis muscle

 

medial surface of tibia

Name one insertion of the masseter muscle

 

angle and ramus of the mandible

Name one origin of the infraspinatus muscle

 

infraspinous fossa of the scapula

Name one origin of the rectus abdominis muscle

 

pubic crest and symphysis

Name one origin of the vastus medialis muscle

 

linea aspera of the femur

Identify the indicated muscle

rectus abdominis

Identify the indicated muscle

sternocleidomastoid

Identify the indicated muscle

depressor labii inferioris

Identify the indicated muscle

sternocleidomastoid

Identify the indicated muscle

sternohyoid

Identify the indicated muscle

external intercostals

Identify the indicated muscle

internal intercostals 

Identify the indicated muscle

brachioradialis

Identify the indicated muscle

levator scapulae

Identify the indicated muscle

extensor digitorum

Identify the indicated muscle

adductor longus

Identify the indicated muscle

gluteus maximus

Identify the indicated muscle

fibularis brevis

What neurotransmitter do motor neurons use to stimulate muscle cells?

acetylcholine

Identify the indicated region of the sarcomere

M-line

Identify the indicated region of the sarcomere

I-band

Identify the indicated structure

sarcoplasmic reticulum

Identify the indicated layer of connective tissue

epimysium

The connective tissue sheath that forms around an individual skeletal muscle cell is called:

endomysium

Define "origin" as it applies to skeletal muscles

immovable site of attachment

Which of the seven criteria used for naming a muscle applies to the rectus femoris muscle?

direction of fibers and location

The three phases of a muscle twitch are the contraction period, the latent period, and the:

relaxation period

By steadily increasing the number of motor units that are activated, we produce a steady increase in the force produced by a muscle. This process is called 

recruitment

Name one action of the sternocleidomastoid muscle

 

rotation of the head

Name one insertion of the biceps brachii muscle

 

radial tuberosity