Unit 5 Day 1 AnatomyUnit 5 Day 1 Anatomy

To understand is To understand is to forgive, even to forgive, even

oneself.oneself.Alexander ChaseAlexander Chase

Today’s AgendaToday’s Agenda

Return TestsReturn TestsNotes on objectives 1-3Notes on objectives 1-3Practice objectives 1-3Practice objectives 1-3Plans for tomorrowPlans for tomorrow

Fig. 38.26, p. 663

Fig. 33.8, p. 566

widthof onemusclecell

cellnucleus

cellsteasedapart forclarity

junctionbetweenadjacent cells

SKELETAL MUSCLE SMOOTH MUSCLE

CARDIAC MUSCLE

Obj. 1

Fig. 38.18, p. 656

triceps relaxes

biceps contracts atthe same time, andpulls forelimb up

tricepscontracts,pulls theforelimbdown

at the same time bicepsrelaxes

Fig. 33.9, p. 566

one muscle cell

biceps

bundle of muscle cells surroundedby connectiveTissue (endomysium

outer sheath of connective tissue around muscle(epimysium)

Fig. 38.20a, p. 658

muscle’s outer sheath (connective tissue)

muscle cell

myofibril

perimysium

fascicle

Fig. 38.20b, p. 658

one myofibrilinside cell:

Z bandZ band H zone Z band

sarcomere sarcomere

I band A band I band

Thick filament

Thin filament

Fig. 38.20c, p. 658

one actinmolecule

thin filament

Arrangement of actin molecules in the thin filaments of a sarcomere

parts ofmyosinmolecule

thick filament

Arrangement of myosin molecules in the thick filaments of a sarcomere

Fig. 38.21, p. 659

Cross-bridgeforms betweenan actin and a myosin filament

Actin filamentslides past myosinfilament, towardsarcomere’scenter, in apower stroke

The cross bridge is broken

Another cross-bridge formsbetween samefilaments

Another powerstroke slides actinfilament closerto the center ofsarcomere

sarcomerebetweencontractions

actin myosin actin

samesarcomerecontracted

Fig. 38.19, p. 657

TRICEPS BRACHII

PECTORALIS MAJOR

SERRATUS ANTERIOR

EXTERNAL OBLIQUE

RECTUS ABDOMINUS

ADDUCTOR LONGUS

SARTORIUS

QUADRICEPS FERMORIS

TABIALIS ANTERIOR

BICEPS BRACHII

DELTOID

TRAPEZIUS

LATISSIMUS DORSI

GLUTEUS MAXIMUS

BICEPS FEMORIS

GASTRONEMIUS

For TomorrowFor Tomorrow

GlovesGlovesGroupsGroupsDepeltingDepelting

Fig. 38.22, p. 660

Pathway 1DEPHOSPHORYLATIONCREATINE PHOSPHATE

Pathway 2AEROBIC RESPIRATION

Pathway 3GLYCOLYSIS ALONE

creatine

oxygenglucose from bloodstream andfrom glycogen breakdown in cells

ADP + Pi

Relaxation

Contraction

Fig. 38.23, p. 660,61

section from spinal chord

motorneuron

Signal from the neuronsystem travel along spinalcord, down motor neuron

T tubule

section from a skeletal muscle

Sarcoplasmic reticulum(calcium storage)

plasmamembraneof skeletalmuscle cell

Z band Z band

one of themyofibrilsinside themuscle cell

Fig. 38.24, p. 661

troponin tropomyosin

actin

myosin head

myosin headmyosinbinding siteblocked

actin

Fig. 38.25, p. 662

peak

relaxation

stimulus contraction starts

time

number of stimuli per second

number of stimuli per second

tetaniccontraction

repeated stimulationtwitch

Fig. 34.13, p. 583

STIMULUSBiceps stretches.

RESPONSEBiceps contracts

axonaxon axon ending

receptor endings

peripheral axon

cell body

cell body

cell body

axon axon endings

dendrites

dendritesINTERNEURON MOTOR NEURONSENSORY NEURON

Spinal cord

animation

Click to view animation.

Unit 5 Day 2Unit 5 Day 2

The most The most difficult thing difficult thing

in life is to in life is to know yourself.know yourself.

ThalesThales

Today’s AgendaToday’s Agenda

Depelting instructionsDepelting instructionsDepeltDepeltClean-upClean-up

DepeltDepelt

Specimen abdominal side up on Specimen abdominal side up on tray.tray.

Incision through pelt only…no Incision through pelt only…no muscles.muscles.

Cut fascia, lift, cut fascia.Cut fascia, lift, cut fascia.

Unit 5 Day 3Unit 5 Day 3

If you want to be respected by others, the If you want to be respected by others, the great thing is to respect yourself.great thing is to respect yourself.

Fyodor DostoyevskyFyodor Dostoyevsky

Unit 5 Day 4Unit 5 Day 4

Too many people overvalue what Too many people overvalue what they are not and undervalue what they are not and undervalue what

they are. they are.

Malcom ForbesMalcom Forbes

Unit 5 Day 5Unit 5 Day 5

Striving for excellence motivates. Striving for excellence motivates. Striving for perfection is Striving for perfection is

demoralizing.demoralizing.

Dr. Harriet BrakerDr. Harriet Braker