Kinematics of Projectiles
What is a projectile?
Anything that moves through the air.
What is a lever?
What does the quadricep do?
Extends the knee.
What does the gastrocnemius do?
Plantarflexes
A nonmoveable joint.
Synarthroses
What is the optimal angle of projection?
45 degrees
Where is the fulcrum in a first class lever?
In the middle of each moment arm.
What do the hamstrings do?
Flex the knee.
What does the anterior tibilais do?
Dorsiflexes
Name two functions of articular fibrocartilage.
Distributing loads, improving the fit of articulations, limiting slip, protection, lubrication, shock absorption.
When is greater than 45 degrees projection optimal?
When the target is above your feet.
Where is the fulcrum in a second class lever?
Closest to the resistance arm.
What does the sartorius do?
Externally rotates the knee.
What lies underneath the gastrocnemius?
The soleus.
Define joint stability.
Preventing joint displacement.
When is less than 45 degree projection optimal?
When the target is below your feet.
Where is the fulcrum in a third class lever?
Closest to the effort arm.
What are the three hamstring muscles specifically?
Semimembranosus, semitendinosus, bicep femoris.
What does the soleus do?
Plantarflexes
Osteoarthritis is disease of what type of tissue?
Articular cartilage
What are the three factors that effect projectiles?
Angle, speed, height.
What is the most common lever in the human body?
Third class
What are the 4 quadricep muscles specifically?
Vastus laterialis, vastus intermedius, vastus medialis, rectus femoris.
Where does the gastronemius insert?
Across the knee joint at the distal end of the femur.
What two sensory receptors influence extensibility of the myotendinous unit?
Golgi tendon organ and muscle spindles.