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Homeostasis & Muscle

Flashcards on body balance, joints, and muscle contraction for Weeks 1–6.

QuestionAnswer
What is homeostasis? Homeostasis is the body’s ability to maintain a stable internal environment despite external changes.
Why is homeostasis important for survival? It keeps body temperature, pH, oxygen, and other internal conditions constant so cells can function properly.
What happens when homeostasis fails? Organ systems stop functioning correctly, leading to illness or death.
Which body systems help maintain homeostasis? The nervous and endocrine systems monitor and adjust internal conditions through feedback mechanisms.
What is a negative feedback loop? A process where a change triggers a response that reverses the original change to maintain balance.
Give an example of a negative feedback mechanism. Regulation of body temperature — sweating cools the body when it overheats.
What is an articulation? An articulation, or joint, is the point of contact between two bones.
What are the three types of joints by movement? Immovable (synarthrosis), slightly movable (amphiarthrosis), and freely movable (diarthrosis).
What type of joint allows the greatest movement? Synovial joints.
What is a synovial joint? A joint where bones are separated by a fluid-filled cavity allowing free movement.
Name two examples of synovial joints. The shoulder and elbow joints.
What role do muscles play in joint movement? Muscles contract to move bones at joints, producing motion.
What are actin and myosin? They are muscle proteins responsible for contraction; myosin pulls actin filaments to shorten muscles.
What is the function of the articular cartilage? It cushions and reduces friction between bones at a joint.
What is the function of synovial fluid? It lubricates joints, nourishes cartilage, and absorbs shock during movement.
Created by: Tisha 256
 

 



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