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A pure phospholipid bilayer with its hydrophobic interior, is permeable to water and gases such as O2, CO2, N2 and small uncharged polar molecules such as urea, ethanol, but is impermeable to large uncharged polar molecules such as glucose, ions (Na+ , K+ , Cl-, Ca2+ ) and charged polar molecules instance for amino acids, ATP, glucose 6-phosphate. The initial group of molecules can cross a biological membrane unaided and without an input of energy, whereas the latter group requires the presence of integral membrane transport proteins and, in many cases an input of energy to travel by the otherwise impermeable membrane barrier. Thus the plasma membrane and the membranes of internal organelles are selectively permeable barriers and maintaining a distinct internal environment.
RESPIR A TIO N IN SCORPION OR SPIDER - Respiratory organs are book lungs. A book lung is a chamber containing a series of thin, vascular, parallel lamellae arranged li
Define the Symptoms in Blood of Pernicious Anaemia? Blood: The RBC count is low-1.5-2.5 million per mm 3 (normal range is 4.5- 5.5 million per mm 3 ). The average diameter o
Explain some Effect of Inadequate nutrition? Inadequate nutrition ranks as one of the major problems of old age. Various factors which may be responsible for the change in one
Q. What is the relation between the maximum and the minimum blood pressure with the phenomena of systole and diastole? A minimum blood pressure is the pressure on the wall of t
How many cells are in the average human brain? Roughly, 6 trillion are in the average human brain.
What is the karyotype found in Down syndrome? Down syndrome is the aneuploidy that is a numeric alteration of chromosomes within the cells compared to the normal number of chro
Determine Food Sources of ascorbic acid (vitamin c)? Food sources of vitamin C include: Rich sources: Amla and guava. Good sources: Drumstick leaves, other leafy ve
What are the Pupillary defects There are certain deviations from normal pupillary reflexes which point towards certain specific pathology.
Monosaccharides :- Sugars consisting of a single polyhydroxy aldehyde or ketone unit.
Determine the Functions of Organ during pregnancy? Dramatic changes occur in renal functions to eliminate the nitrogenous and other waste products of maternal and foetal metabo
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