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Explain the term 'coupling medium' and why it is used in ultrasound imaging.

The extent to which incident ultrasound waves are reflected at a surface boundary is proportional to the difference in acoustic impedence between the two...

Answered by Calem C. • Physics tutor

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Describe what happens to fish protein in the human stomach.

Digestion takes place in the stomach. Aside from physical digestion due to churning of the stomach muscle, chemical digestion is also important whereby hydrochloric acid produced by the stomach of pH 2, a...

Answered by Panos L. • Biology tutor

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Part of the retina of a young rat was removed and kept in the dark for two hours. This allowed the pigment in the rod cells to recover from bleaching caused by exposure to light. Suggest what happens in the rod cells during this two hours of darkness.

Rhodopsin is the pigment found in rod cells, which consists of cis-retinal and the protein opsin. When the rod cells are kept in darkness, the opsin is uncoupled from the cell surface membrane of the rod ...

Answered by Panos L. • Biology tutor

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Give the ideal gas equation, defining and justifying the inclusion of each variable, and state 5 assumptions made in the kinetic theory:

pV = nRT where: p = pressure; V = volume; T = temperature; n = moles; R = molar gas constant. pV/T = constant from ...

Answered by Calem C. • Physics tutor

5243 Views

Explain how the sinoatrial node (SAN) ensures that oxygenated blood enters the aorta.

The sinoatrial node is a region found on the right atrium which acts as a pacemaker. Cells at the SAN can depolarise (become more positively charged with respect to the outside) and generate electrical ac...

Answered by Panos L. • Biology tutor

9050 Views