BI 202 August 23 - BI 202 Human Physiology Physiology:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
BI 202 – Human Physiology Physiology: study of biological function; how the body works Different levels of organization which physiology can be studied at: o Organism o Organ o Tissue o Cellular o Molecular Cells o We’re made up of 75 trillion cells o Differentiate the cells to have specific cell types Cell types o Only about 200 cell types o Movement across the plasma membrane; extract energy from organic nutrients o **interact with their immediate environment** If the cells are put together, they form tissues o Types of tissues Connective tissue: adipose, anything that doesn’t fit into the other types Muscle tissue Nervous tissue Epithelial tissue Put the tissues together to form organs Put organs together to form systems or organ systems o Systems work together o Vital for life, essential for survival Cells don’t need systems o capable of performing their own fundamental activities extract nutrients from immediate environment change carbohydrates make lipids etc o Interact with their immediate environment Amoeba: single celled organism, found in pond, it’s immediate environment is the water in the pond For body cells: immediate environment is the extracellular fluid (ECF) Divided into o Plasma Fluid part of blood along with proteins and clotting factors which are dissolved in it (other part of blood is the formed part of blood: cells and platelets) o Interstitial fluid Fluid between cells, outside of blood vessels, sometimes called tissue fluid Plasma goes from blood into space around cells then called interstitial fluid Technically, the interstitial fluid is the immediate environment o Red blood cells stay in the blood vessels
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
o To get O2 into cells, it has to leave red blood cells and diffuse o Cells to get O2 from interstitial fluid ICF: intracellular fluid: inside the cell Organs and organ systems interact with their external environment o b/c they’re modifying our internal environment to make inside environment suitable for cells to perform their own functions ex: respiratory sys: bring O2 in, cardiovasc sys brings it in where cells can then use it kidneys filter blood and get rid of metabolic waste, make sure internal environment is still acceptable for cells to function cells are exposed to the internal environment, not the external environment homeostasis: maintenance within set limits. Internal constancy is often critical for proper cellular function (coined by physiologist: Walter Cannon, 1871-1945)<won’t be asked name and date organ and organ systems are necessary to allow cells to function o when they don’t, you die because the cells cannot continue doing their immediate functions and tissues die and the organ systems don’t work and one ceases to function Table 1.2: Shows normal blood values o Organ and organ systems help maintain within those limits o This happens through Homeostasis is often maintained through reflexes called negative feedback systems or mechanisms
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 17

BI 202 August 23 - BI 202 Human Physiology Physiology:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online