BIO2A03-2011-L7-template

BIO2A03-2011-L7-template - Biology2A03 Lecture7...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Biology 2A03 Lecture 7 Circulation I
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 1.Which statement regarding intra cellular receptors is false : A)They bind lipophobic ligands on the cell surface B)They act as transcription factors C)They bind lipophilic ligands in the cytosol D)They evoke changes in synthesis of a protein 2 . Second messengers of signal transduction pathways: A) Can amplify the signal from the first messenger B) Act as chemical relays from the plasma membrane to the biochemical machinery inside the cell C)Bind to the receptor ligand binding site D)Both A and B E) none of the above are correct
Background image of page 2
3 The Circulation Why have a circulatory system? Diffusion times (t) are proportional to the distance (x) over which  diffusion occurs. Diffusion gradients for nutrients or wastes can decrease over large distances Unicellular organism Wastes        Nutrients      Diffusion  Diffusion           Multicellular organism Driving force
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 Circulatory Systems A fa s t c o nve c tio n s ys te m  = ra pidly c irc ula ting  fluids   b e twe e n s urfa c e s  tha t e q uilib ra te                               a nd                                   o rg a nis m s 1 ˚  ro le   = 2a ry ro le  =  S ys te m  c o ns is ts  o f:  1) 2) 3) dis trib utio n o f dis s o lve d g a s e s  a nd m o le c ule s  fo r            1) A C o nve c tive  m e dium  =  b lo o d 2) Plum b ing  =  b lo o d ve s s e ls 3) A Pum p =  he a rt (s e ns o ry a nd e ndo c rine  func tio ns ) (re g ula te s  b lo o d                   a nd b lo o d                         ) (                           s ys te m  –c o nne c ts )  e .g . c he m ic a l m e s s e ng e rs
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

BIO2A03-2011-L7-template - Biology2A03 Lecture7...

This preview shows document pages 1 - 5. Sign up to view the full document.

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