Muscular System

Did you know? 40% of our body weight is muscle There are over 30 facial muscles The meat you eat are the organisms muscles Which the biggest muscle? The heart is a muscle

Skeletal Muscle Fibers Muscles of the Body Made up of: ________ muscle tissue _________ tissue ________ Vessels ___________ Skeletal Connective Blood Skeletal Muscle Fibers

Skeletal Muscle Fibers Are grouped in bundles called _________ __________ are bundled together by __________ tissue to create a __________. Fasicle Fasicles Connective muscle

Muscle Fibers Contain many _________ which have two filaments 1. Actin _________ 2. Myosin ________ myofibrils (thin) (thick)

Actin vs Myosin

Table Talk Muscle fibers have many nuclei. Which other organelle would be the most abundant in muscle fibers? Why? Complete the flow chart in your notes

Which muscle is being used? https://www.youtube.com/watch?v=KHysl3kYOB4

Which muscle is being used?

Which muscle is being used?

Which muscle is being used?

Muscle Review Game http://www.purposegames.com/game/forensic-bio-major-muscles-game

How does this effect movement?

How does this effect movement?

Tendons vs Ligaments Tendons Attach muscle to _________ Ligaments Attach bone to _________ bone bone

Muscles Move in Pairs Muscles move in ____________ pairs opposite While one _________ the other __________ opposite flexes extends

How Muscles Contract Actin and myosin _____ Myosin ______ actin Results in muscle __________ Muscle fibers ________ Muscles relax bind pulls contraction detach Actin and myosin bind (forms cross bridge) Myosin pulls actin (power stroke) https://www.youtube.com/watch?v=Ct8AbZn_A8A **ATP is required

Muscle Contraction

Livor Mortis Blood __________ in body parts closest to the ___________ Skin appears ____________ Onset __________ after death Last about __________ accumulates ground Blue-purple 30 minutes 12 hours

What effects Livor Mortis? Affected by things that __________ blood flow E.X Helps determine if the body _____________ restrict has been moved

Estimating Time of Death Rigor Mortis The stiffening of ________ after death Muscles remain ________ muscles contracted Muscles remain contracted due to an accumulation of calcium.

Continued Starts __________ after death Begins to reverse around _________ 2 hours 15 hours

What can you tell me about this victim?

Example #1 Is this livor mortis or rigor mortis? Explain the pattern on the body?

Example #2 Which muscles are effected by rigor mortis? How long has she been dead?

Example #3 Explain the markings on the pig

Example #4 Where does lividity appear?

Algor Mortis Cooling ________ of the body after ______ death Body cools at ____ degrees/hour Cooling death 1.5

Which muscle(s) am I using? Bicep Curl Wall squat Leg extension Shoulder fly Sit up Cherry picker Identify the flexor and extensor for each exercise.

Factors Effecting Algor Mortis Amount of body fat Amount of _____ _____________ Clothing Temperature

Table Talk Are fainting goats correctly named? Why or why not? https://www.youtube.com/watch?v=AEmRfxxGGcE

Kenny Oh no! Someone killed Kenny! The body of Kenny was found this morning in the front office, according to investigators his body temperature was 72.6 degrees. How long has he been dead?

Miley Cyrus The body of Miley Cyrus was found last night, according to investigators her body temperature was 50.2 degrees. How long has she been dead?

Carl Looks like a Walker finally got to Carl! Carl’s body (or what’s left of it) was found on a snowy embankment. According to investigators his body temperature was 78.6 degrees. How long has he been dead? How did the weather effect the cooling of his body? Explain your answer.

Kim Kardashian Kim Kardashian was found dead on Sunday, she was dressed in a velvet track suit and a beanie. According to investigators her body temperature was 86.4 degrees when they arrived on scene. How long has she been dead? How long has she been dead? How did her clothing effect the cooling of her body? Explain you answer.

Homer Simpson Homer Simpson has eaten his final donut. His body was found on Friday afternoon, according to investigators his body temperature registered at 82.6 degrees. How long has he been dead? How did his body mass effect the cooling of his body? Explain your answer.

James Marsden The body of James Marsden was found face down at the Santa Fe dam. His body was found lying face up. There were blue-purple marking on his back. Was his body moved after death? What leads you to think this?

Young Girl You arrive at your crime scene and see the body of a young girl. She is lying face down in the grass with her arms under her body and her legs were shaped in an ‘x”. There are blue-purple marking covering the entire back of her body, EXCEPT for her buttocks and shoulders which were left in the coloring of her normal skin tone