Biology 1002 Winter 2025: Form and Function Summary

Key Concepts

  • Animal form and function are correlated at all levels of organization.
  • Feedback control maintains internal environment in many animals.
  • Homeostatic processes for thermoregulation involve form, function, and behavior.
  • Energy requirements relate to animal size, activity, and environment.

Anatomy and Physiology

  • Anatomy: Study of biological form of an organism.
  • Physiology: Study of functions an organism performs.
  • Comparative studies reveal form and function correlation.

Evolution of Size and Shape

  • Physical laws constrain strength, diffusion, movement, heat exchange.
  • Larger animals need proportionately larger skeletons for support.

Exchange with the Environment

  • Rate of exchange is proportional to cell's surface area; materials exchanged through cell membranes.
  • Specialized internal exchange surfaces (i.e., small intestine) maximize nutrient absorption.

Hierarchical Organization

  • Animals consist of specialized cells organized into tissues, organs, and organ systems.
    • Organ systems (e.g., digestive, circulatory).

Tissue Types

  1. Epithelial: Covers body surfaces and lines cavities, varies in shape and arrangement.
  2. Connective: Binds/supports tissues; includes types like blood, cartilage, and bone.
  3. Muscle: Contracts in response to stimuli; includes skeletal, cardiac, and smooth muscle.
  4. Nervous: Composed of neurons and glial cells; transmits nerve impulses.

Homeostasis

  • Regulates internal environment through feedback mechanisms.
  • Negative feedback: Returns variable to normal range; Positive feedback: amplifies stimulus.

Thermoregulation

  • Endotherms: Generate heat through metabolism (e.g., birds, mammals).
  • Ectotherms: Rely on external sources for heat (e.g., reptiles).
  • Heat loss/gain via radiation, evaporation, convection, conduction.

Thermoregulation Mechanisms

  • Adaptations for thermoregulation include insulation, circulatory adaptations, behavioral responses, and metabolic adjustments.

Energy Requirements

  • Metabolic rate measures energy use; varies with size and activity.
  • Basal metabolic rate (BMR): Endotherm's metabolic rate at rest; Standard metabolic rate (SMR): Ectotherm's at specific temperature.
  • Smaller animals typically have higher metabolic rates.