Why do molecules in solids not diffuse into one another? Why does diffusion occur in marine organisms? Why do capillaries need to be thin-walled? How does gas exchange occur in the lungs? How does smoking affect the alveoli in the lungs?
What effect does temperature have on rate of diffusion? What factors affect diffusion? Why does temperature difference increase the rate of heat transfer? Why can't polar molecules cross by simple diffusion? Why does diffusion occur in marine organisms?
Paracrine Signaling:This form of communication takes place between cells that are near each other, but are not connected. In this case, the cells talk via the diffusion of chemical signaling molecules across short distances.Synaptic signalingbetweenneurons(brain cells) is an example of paracrine sign...
Why were the older population reluctant to believe in the risk and take protection measures when faced with abrupt and severe public health risks that rarely occur? Is it due to their lack of trust in the official and online media, or because of the impediments presented by social and ...
Endocytosis refers to invagination of a small region of plasma membrane, forming an interacellular membrane-bound vesicle. It has been observed in many kinds of animal cells, where the plasma membrane is in direct contact with external medium. Endocytosi
Four major zinc transporter families have been identified: (1) P-type ATPases; (2) RND (resistance, nodulation and division) multidrug efflux transporters; (3) the Zrt-, Irt- like protein (ZIP) family (Slc39A); and (4) the superfam- ily of cation diffusion facilitators (CDF) that ...
(b) What are their functions in the spinal cord? How do the vasa recta promote countercurrent exchange? Why does diffusion of gases constrict and dilate? The Purkinje fibers extend into the papillary muscles. What is the significance of this? What characteristic defines a chordate who is...
The initial lag phase where the nutrients are plentiful and the bacteria are metabolically active but not yet dividing, the exponential phase in which the bacteria are rapidly dividing, the stationary phase which occurs due to nutrients getting used up and...
Why is diffusion important to cells? For what purpose does a cell use the energy from redox reactions in cellular respiration? Why is photolysis necessary for photosynthesis to occur? What factors affect cellular respiration? Why does O2 come from H2O in photosynthesis?
Why does the Krebs cycle occur in aerobic cellular respiration? Why do some cells have more mitochondria? Why is diffusion important to cells? Explain in detail the mechanism of gas exchange in the lungs and the importance of oxygen in the body. ...