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sheila smith

Physiology Weeks 1-6

QuestionAnswer
What is homeostasis? The body’s ability to maintain a stable internal environment despite external changes.
Which systems primarily maintain homeostasis in the body? The nervous and endocrine systems.
What are the four main types of biomolecules? Carbohydrates, lipids, proteins, and nucleic acids.
What is the main function of DNA? To store genetic information used to build and maintain the organism.
During which cell cycle phase does DNA replication occur? The S (synthesis) phase
What does the fluid mosaic model describe? The flexible structure of the cell membrane made of phospholipids, proteins, and cholesterol.
What are the three main types of cell signaling? Autocrine, paracrine, and endocrine signaling.
What are the four main tissue types in the body? Epithelial, connective, muscle, and nervous tissue.
What type of connective tissue makes up most of the skeleton? Bone tissue (osseous tissue).
What are the primary functions of the skeletal system? Support, protection, movement, storage, and blood cell production.
What is an articulation? A joint where two or more bones meet.
Name the three main structural types of joints. Fibrous, cartilaginous, and synovial.
Which two proteins are essential for muscle contraction? Actin and myosin.
What is the role of myosin in muscle contraction? It forms cross-bridges with actin and pulls thin filaments inward.
What is actin’s function in muscle fibers? Provides binding sites for myosin to enable contraction.
 

 



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