MIND TRIP

«When the spirits are low, when the day appears dark, when work becomes monotonous, when hope hardly seems worth having, just mount a bicycle and go out for a spin down the road, without thought on anything but the ride you are taking».
#医学生Medic[超话]##medicaltalks#

Aortic Valve stenosis occurs when calcium deposits on the valve cause the leaflets to become stiff. As the condition progresses, the valve opening narrows, obstructing blood flow and forcing the heart to pump harder. ⠀
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Severe aortic stenosis is a progressive disease that often occurs with no outward symptoms and so may go undetected. ⠀
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Symptoms of severe aortic stenosis include: shortness of breath upon exertion, reduced exercise capacity, chest pain or tightness and feeling faint or fainting upon exertion. ⠀
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#医学生Medic[超话]##medicaltalks#

The salivary glands are exocrine glands that produce saliva through a system of ducts. Humans have three paired major salivary glands (parotid, submandibular, and sublingual), as well as hundreds of minor salivary glands. Salivary glands can be classified as serous, mucous, or seromucous (mixed).
In serous secretions, the main type of protein secreted is alpha-amylase, an enzyme that breaks down starch into maltose and glucose, whereas in mucous secretions, the main protein secreted is mucin, which acts as a lubricant.
In humans, between 0.5 and 1.5 litre of saliva are produced every day. The secretion of saliva (salivation) is mediated by parasympathetic stimulation; acetylcholine is the active neurotransmitter and binds to muscarinic receptors in the glands, leading to increased salivation.

#医学生Medic[超话]##medicaltalks#