H3 and H4 histones first form heterodimers that then come together to form a tetramer with two molecules each of H3 and H4. While H2A and H2B form heterodimers in solution but not tetramers. This assembly without DNA called Histone-only Intermediates 

TLS Online TPP Program

#Id: 1169

#Unit 7. System Physiology – Animal

The ideal glomerular marker is inulin.

TLS Online TPP Program

#Id: 1170

#Unit 7. System Physiology – Animal

The clearance of inulin equals the GFR.

TLS Online TPP Program

#Id: 1171

#Unit 7. System Physiology – Animal

Glomerular hydrostatic pressure is determined by three variables: 

1. Arterial pressure

2. Afferent arteriolar resistance

3. Efferent arteriolar resistance

TLS Online TPP Program

#Id: 2566

#Unit 7. System Physiology – Animal

Tubular reabsorption is quantitatively large & highly selective.

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#Id: 2567

#Unit 7. System Physiology – Animal

Reabsorption

Water and many solutes (e.g., Na+, Cl−, HCO3−, glucose, amino acids, urea, Ca2+, Mg2+, phosphate, lactate & citrate) are reabsorbed from the glomerular filtrate into the peritubular capillary blood.

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#Id: 2568

#Unit 7. System Physiology – Animal

Secretion

A few substances (e.g., organic acids,

organic bases, K+) are secreted from peritubular capillary blood into tubular fluid for excreting substances in the urine.