Cedarville A&P 1 Exam 1
Describe a skeletal muscle fiber - ANSWER-Made up of myofibrils Myofibrils are wrapped in sarcoplasmic reticulum T-tubules between sarcomeres
Explain the organization of a myofibril - ANSWER-Made of many sarcomeres Wrapped in sarcoplasmic reticulum Sarcomeres are myofilaments
Name and describe the function of the contractile, regulatory, and structural protein components of a sarcomere - ANSWER-Contractile: myosin and actin (slide past each other to shorten/contract the sarcomere)
Regulatory: troponin and tropomyosin (regulate when myosin can bind with actin)
Structural: titin (ensures that it goes back to original shape)
Identify the internal structural components of spongy bone - ANSWER-Trabeculae (irregular latticework of thin columns of bone surrounding many spaces, often filled with red bone marrow)
Structural components of a long bone - ANSWER-Diaphysis (main stretch) Metaphysis (where it begins to flare on proximal/distal ends) Epiphysis (ends of both proximal/distal) Medullary canal (within the diaphysis) Yellow bone marrow (within medullary canal) Periosteum (outer layer of bone) Articular cartilage (hyaline cartilage where bone articulates) Epiphyseal plate/line (growth occurs here)
Explain the roles osteogenic cells play in the formation of bone tissue - ANSWER-The initial bone cell. All other bone cells come from this
Explain the process of intramembranous ossification - ANSWER-Development of ossification center Calcification of the bone matrix Formation of trabeculae Development of the periosteum and compact bone
Describe the major functions of the skeletal system - ANSWER-Structural framework Protection Assist in movement Mineral homeostasis
- / 1