chapter 6-1: Skeletal system intro Essential Question: List all 5 physiological functions of bone. chapter 6-1: Skeletal system intro Learning Target Identify the functions of bone. List the three types of skeletal cartilage. Define apostitional and interstital cartilage growth.
announcements Chapter Test Retake (>70%) Completed stamp sheet assignments Retake score will be permanent No retakes on Chapter 7 Bone Practical Class website will be updated today Stamp Sheet will be distributed tomorrow Quiz 1 scheduled for: Friday, 10/19/18 Quiz 2 scheduled for: Tuesday, 10/23/18 Chapter 6 Test scheduled for: Thursday, 10/25/18 Last Day to Stamp Chapter 6: Wednesday, 10/24/18
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Overview: skeletal system Our skeletal system is made of bone and cartilage.
Overview: skeletal system Our first skeleton is made of cartilage.
Overview: skeletal system As we age, most cartilage turns to bone, but some remains in the adult skeleton.
Overview: skeletal system In adults, cartilage is found where flexibility is needed.
Overview: skeletal system Cartilage also connects bone and is found in the joints.
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Physiology: Bones (5) Support: form the framework that supports the body and cradles soft organs Protection: provide a protective case for the brain, spinal cord, and vital organs Movement: provide levers for muscles Mineral Storage: reservoir for minerals, especially calcium and phosphorus. Bones also store fat Blood Cell Formation: hematopoiesis occurs within the red marrow cavities of bones
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Skeletal cartilage contains no blood vessels or nerves.
There are 3 types: hyaline, elastic, and fibrocartilage. Skeletal cartilage There are 3 types: hyaline, elastic, and fibrocartilage.
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hyaline cartilage Provides support, flexibility, and resilience Is the most abundant skeletal cartilage
hyaline cartilage Hyaline Cartilage is found in these types of cartilage: Articular Costal Respiratory Nasal
Articular: covers the ends of long bones Hyaline cartilage Articular: covers the ends of long bones
Costal: connects the ribs to the sternum Hyaline cartilage Costal: connects the ribs to the sternum
Respiratory: makes up larynx, reinforces air passages Hyaline cartilage Respiratory: makes up larynx, reinforces air passages
Nasal: supports the nose Hyaline cartilage Nasal: supports the nose
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elastic cartilage Similar to hyaline cartilage, but contains elastic fibers Found in the external ear and the epiglottis
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fibroCartilage Highly compressed with great tensile strength Contains collagen fibers
Found in menisci of the knee and in intervertebral discs fibroCartilage Found in menisci of the knee and in intervertebral discs
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Growth of Cartilage Appositional: from the outside There are 2 ways cartilage can grow: Appositional: from the outside Interstitial: from the inside
Growth of Cartilage Appositional: (from the outside) cells in the perichondrium secrete matrix against the external face of existing cartilage
Growth of Cartilage Interstitial: (from the inside) lacunae-bound chondrocytes inside the cartilage divide and secrete new matrix, expanding the cartilage from within
Growth of Cartilage Calcification of cartilage occurs: During normal bone growth During old age