Muscular system 1
Thin filaments are made of protein molecules called___
actin
Thick filaments are made up of_____-
myosin
The energy required for muscle contraction is obtained from_________
ATP
The theory used to explain the process of muscle contractions.
Muscles only______,they don't push.
pull
Wrapped in perimysium
Fascicles
Muscle cells are long fibers that run parralel to each other and are held together by?
Endomysium
Skeletal muscle is __________________ (striated/not striated and ______________________ (voluntary/involuntary)
striated
voluntary
What is the main overall function of the Muscular system?
Movement
Cardiac muscle is ______________ (striated/not
striated) and _____________ (voluntary/involuntary)
with darkened bands called________________ discs.
striated
involuntary
intercalated
Which muscle cells have one nucleus, are not striated and are controlled involuntarily?
Smooth
What are the three types of muscle cells?
Skeletal, Smooth, and Cardiac
An electrical/nerve impulse
Action Potential
What is the name of the action of the myosin head uses energy to pull an actin filament inward which shortens or contracts the whole muscle
Powerstroke
A motor neuron and the muscle fibers it innervates is called...
Motor unit
The contractile unit of a skeletal muscle, situated between the Z-lines is called
Sarcomere
The myosin head forms a ___________ when it attaches to the binding site on the actin filament.
Cross Bridge
This structure is where Ca+ ions travel to get to the actin filaments
T-Tubules
When a signal arrives at your motor neuron, the neuron releases ____________.
ACh
Acetycholine
Striations or the banded microscopic appearance is due to the alternating _______ and ________ bands.
I and A bands
What are 3 general functions of the muscular system
Heat Production
Movement/Posture
Protection of Joints
From superficial to deep, list the CT membranes that surround muscle tissue.
Epimysium
Perimysium
Endomysium
When a muscle fiber is at rest, which two proteins are blocking the binding sites on the actin filament?
Troponin
Tropomyosin
The process of muscle contraction will continue until...
Name BOTH
ACh stops being released and calcium is removed
ATP runs out
Put these steps in order:
a. ATP creates a power stroke, shortening actin
b. Signal travels down the motor neuron
c. Actin changes shape
d. Cross bridges form
e. Calcium is released from sarcoplasm
b. Signal travels down the motor neuron
e. Calcium is released from sarcoplasm
c. Actin changes shape
d. Cross bridges form
a. ATP creates a power stroke, shortening actin