Skeletal & Muscular Systems

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Presentation transcript:

Skeletal & Muscular Systems Packet #86 Chapters #40 & 49 Saturday, February 23, 2019

THE SKELETAL SYSTEM Saturday, February 23, 2019

The Skeletal System The skeletal system has three main functions Protection Support Movement Additionally, the skeleton can come in three different forms Hydrostatic skeleton Exoskeleton Endoskeleton Saturday, February 23, 2019

Hydrostatic Skeleton Consists of fluid held under pressure in a closed body compartment Cnidarians Flatworms Earthworms Move by using muscles to change the shape of the fluid filled compartments Saturday, February 23, 2019

Exoskeleton Hard encasement deposited on the surface of an animal Mollusks Kingdom Animalia Phylum Mollusca Snails Oysters Slugs Saturday, February 23, 2019

Endoskeleton Endoskeletons Consists of hard supporting elements, such as bones, buried within soft tissues of an animal. Humans Axial Skeleton Skull 8 cranial bones 14 facial bones Vertebral column (backbone) Rib cage 7 pairs of true ribs 3 pairs of false ribs 2 pairs of floating ribs Appendicular Skeleton Limb bones Pelvic girdles Saturday, February 23, 2019

Muscular System Saturday, February 23, 2019

Muscular System I Responsible for animal movement Three types of muscle Skeletal muscle Attached to bones and causes movement of the body Cardiac Muscle Responsible for the rhythmic contractions of the heart Smooth Muscle Lines the walls of hollow organs Lines the walls of blood vessels and the digestive tract Saturday, February 23, 2019

Types of Muscle Saturday, February 23, 2019