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Unit 3 Chapter 9
Assignment connect bio 210
| Question | Answer |
|---|---|
| The fusion of the right and left mandible into a single mandible bone during fetal development is an example of the formation of what kind of joint? | Synostosis |
| How are individual joints typically named? | Based on the names of the bones involved in the joint |
| An articulation, or joint, is defined as _________blank. | any point where two bones meet |
| The classification of a joint as bony, fibrous, cartilaginous, or synovial describes which of the following? | How the bone ends are held together within the joint |
| What is a syndesmosis held together by? | Long collagen fibers |
| fibrous joints: | -In syndesmoses joints, the fibers are longer, and the attached bones are more movable. -In sutures and gomphoses, the fibers are very short and allow for little or no movement. |
| Sutures are immobile, or only slightly mobile, fibrous joints that closely bind the bones of the skull to each other. T or F | True |
| Lap sutures occur where two bones have overlapping beveled edges. TRUE FALSE | true |
| What is a cartilaginous joint in which hyaline cartilage binds the bones together called? | Synchondrosis |
| In a symphysis, bones are held together by | Fibrocartilage |
| Choose the statement that correctly pairs the type of cartilaginous joint with its example. | The joint between the bodies of two vertebrae is an example of a symphysis joint. |
| examples represent a bony joint, or synostosis? | An infant is born with right and left mandibular bones, but they soon fuse into a single bone. |
| Which structure attaches a muscle to bone and helps stabilize a synovial joint? | Tendon |
| A _________-class lever is one with the fulcrum in the middle | first |
| A ________-class lever has the resistance in the middle. | second |
| In a _______-class lever, the effort is applied between the fulcrum and resistance. | third |
| A second-class lever occurs at the atlanto–occipital joint of the neck, where the muscles of the back of the neck pull down on the occipital bone of the skull and oppose the tendency of the head to tip forward. True False | False; First class lever |
| Most musculoskeletal levers are first-class levers. True False | False; Third class |
| What will result in the mechanical advantage of a lever being speed. | If LE, the length of the effort arm, is (55mm) and LR, the length of the resistance arm, is (200mm). |
| factor(s) that limit a joint's range of motion: | -Bones are joined by ligaments that limit their movement. -Well-exercised muscles of a shoulder joint will limit the possibility of a dislocation. -Joint movement is limited by the shapes of the bone's articular surfaces. |
| When extending the elbow, it is the shape of the olecranon of the ulna and the olecranon fossa of the humerus that limit its range of motion. Is this a factor that limits a joints range of motion? | yes |
| Which movement straightens a joint, returning it to zero position? | Extension |
| What is movement of the foot upwards, as when walking on your heels, called? | Dorsiflexion |
| Most shoulder dislocations occur in which direction? | Anteriorly |
| Choose the factors that determine a joint's range of motion. | 1. In many cases, joint movement is limited by the shapes of the bone surfaces. 2. Bones are joined by ligaments that limit their movement. 3. In many joints, pairs of muscles oppose each other and moderate the speed and range of joint motion. |
| What three structures are affected in an "unhappy triad" injury to the knee? | Anterior cruciate ligament Medial meniscus Tibial collateral ligament |
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