Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
What is the definition of a third class lever?
What is the definition of a third class lever?
- Effort is applied between resistance and the fulcrum. (correct)
- Effort and resistance are both applied at one end.
- The lever has a fixed fulcrum at the center.
- Effort is applied at one end and resistance at the other.
What is an example of a third class lever in the human body?
What is an example of a third class lever in the human body?
Elbow
What joint acts as the fulcrum in the mandible when it functions as a third class lever?
What joint acts as the fulcrum in the mandible when it functions as a third class lever?
Temporomandibular joint
Which muscle exerts the effort when the mandible functions as a third class lever?
Which muscle exerts the effort when the mandible functions as a third class lever?
Signup and view all the answers
Flashcards are hidden until you start studying
Study Notes
Third Class Levers Overview
- Fulcrum: the pivotal point in a lever where the lever arm rotates.
- Resistance: the load or weight that must be overcome by the lever.
- Effort: the force applied to move the resistance; in third class levers, this is applied between the fulcrum and the resistance.
Characteristics of Third Class Levers
- Most prevalent lever type in the human body.
- Commonly found in various joints that involve a range of motion and lifting tasks.
Examples of Third Class Levers
-
Elbow Joint:
- The biceps brachii muscle applies effort to flex the elbow.
- Resistance is determined by the weight in the hand or the forearm’s weight.
-
Mandible Function:
- Serves as a third class lever when biting into food.
- The temporomandibular joint acts as the fulcrum during this motion.
Key Joint in Mandible Lever System
- Temporomandibular joint functions as the pivotal fulcrum.
- Temporalis muscle exerts the required effort for jaw movement and biting.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
