BISC 101 Lecture Notes - Lecture 15: Epithelium, Muscle Tissue, Thermoregulation

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 101
• Professor: Tony Williams

Document Summary

Large sa relative to volume (or mass) -short diffusion distance between environment and cells. Sa:volume ratio decreases (distance between cells and environment increases) Branched or folded surfaces allow for sufficient exchange with environment (gut,lungs/gills, kidney) Specialised transport systems (digestive and respiratory system) and specialised fluids (interstitial, blood) link each cell with environment. (specialised) cells are organised into tissues (where many have common appearance and function): Organs: different tissue types are organised into functional units. Organ systems: groups of organs working together. Response involves changes in receptors for each signal membrane potential at specific target cells. Homeostasis (stability of an animal"s internal environment despise changes in external environment) Regulators: use internal control mechanisms to regulate and maintain homeostasis (thermoregulation, osmoregulation) Conformers: internal (body) environment changes with change in external environment. Many plasma metabolites, nutrients and ions are regulated at particular values (temp) (glucose, calcium, iron and na, k) -important for cell (neuron, muscle) function.