What is a distinguishing characteristic between simple diffusion (SD) and facili

Question

What is a distinguishing characteristic between simple diffusion (SD) and facilitated diffusion (FD)? a. SD molecules pass through the lipid bilayer: FD, they pass through a protein b. SD, molecules move up their concentration gradient: FD, they move down their concentration gradient c, SD, hydrophilic molecules cross the membrane: in FD, hydrophobic molecule cross the membrane d. SD, active transport is used: FD, it is not e. SD, energy is not required: FD, energy is required Given each scenario, identify the type membrane transport used: (exocytosis, phagocytosis, endocytosis, transcytosis) (suggestion: create a rubric with your summary of each of these definitions, list an example of each that highlights the differences between and perhaps draw a picture. One thing expert physiologists due that they learned over time is to draw out physiology when they are given a question) a. Epithelial cells can move compounds from one side of the epithelium to the other by this form of membrane transport b. A protein hormone is released from cells in the brain using this form of membrane transport c. An endolysosome is formed during this membrane transport d. Bacteria cleared from our bodies by this form of transport Given each scenario, identify the chemical messenger being used: (paracrines, autocrines, cytokines, neurotransmitters, hormones a. Chemical messengers that are often secreted by white blood cells, are involved in the immune response b. Chemical messengers that are released from endocrine glands c. Chemical messengers that communicate with neighboring cells d. Chemical messengers that act on the cells that secreted them e. Chemical messengers released from neurons that communicate via synaptic signaling. What variable(s) is the equilibrium potential dependent on? a. Concentration gradient for one ion b. Concentration gradient for multiple ions c. permeability d Concentration gradient for one ion and relative ion permeability e. Concentration gradient for multiple ions, relative ion permeabilities, electrical gradient for each ion involved

Explanation / Answer

Answer25:C--SD hydrophilic molecule cross the membrane,in FD hydrophobic molecule cross the membrane.

In order for substances to pass through a cell membrane by SD it must penetrate the hydrophobic core of the phospholipid bilayer .

Eg:carbondioxide,oxygen,ethanol which are all hydrophopic in nature.

In FD hydrophillic and large molecules are allowed to pass through the membrane.

Answer26:A-Cytokines

B-Hormones

C-Paracrines

D-Autocrines

E-Neurotransmitters

Answer27:A-Concentration gradient for one ion

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