Topic 19: The Muscular Organization (Vázizmok)

- piece at that spot are three types of musculus (skeletal, polish as well as cardiac) constitute inward the human body, the next department volition solely bargain amongst skeletal muscle

- nearly 40% of the body's volume is muscle
- the human trunk contains to a greater extent than than 600 muscles

-skeletal muscles are attached to bones past times tendons (ínak) at two points: the origin (eredet), which is attached to the os that doesn't displace when the muscles contracts or relaxes, as well as the insertion (tapadás), which is attached to the os that moves

- Muscle pairs tin hold out classified equally antagonistic (when the percentage inward an contrary manner) eg. bicep as well as tricep, or synergistic (when they "work together") eg. extensors as well as triceps

How muscles contract:

- outset nosotros must review the construction of muscles

- muscles are formed of bundles of muscle fibers (izomrost nyalábok)

- each musculus fiber is a single, giant cell.

- inside each musculus prison theater mobile telephone or fiberthere are thousands of myofibrils (izomfonal)

- a myofibril is made upwards myofilaments, of which at that spot are two kinds: myosin as well as actin

- myosin is referred to equally the thick filament, piece actin is the sparse filament

- the myofilaments are arranged into segments called sarcomeres

Source:  http://www.biologycorner.com/anatomy/muscles/notes_muscles.html

- agreement the construction of the sacromere as well as the organization of myosin as well as actin allows us to sympathise the Sliding Filament Theory, which explains how musculus contraction occurs.

- if the video doesn't connect, larn to this address:  http://www.youtube.com/watch?v=Ct8AbZn_A8A

Sliding filament theory (becsúszó mechanizmus elmélete)

1.  A nervus impusle causes calcium to hold out released from the sacroplasmic reticulum into the infinite some the myofilaments

2.  Calcium binds the troponin complex (which is wrapped some the actin filaments), causing it to shift seat as well as discover the myosin binding sites on the actin filaments

3.  Myosin caput binds to actin, ATP reacts to ADP as well as P

4.  Myosin releases, cocks dorsum as well as ATP replaces ADP to start a novel bicycle of motility for myosin

5.  When the nervus impulse ends, calcium is pumped dorsum into the sarcoplasmic reticulum, the troponin complex covers the binding site as well as the musculus relaxes.

For to a greater extent than explanation go here

Muscles percentage to allow us displace (locomotion).  They besides create estrus issue energy equally solely a percentage of the issue energy inward ATP is used for motion