Water-soluble nutrients stored in blood are routed directly from the small intestine through the portal vein to the liver before any other organ. The portal vein or hepatic portal vein is a blood vessel which carries blood from the GI tract, to the liver. The blood contains nutrients and toxins extracted from digested contents. The portal vein is not a true vein, since it conducts blood to capillary beds in the liver and not directly to the heart. It is the main component of the hepatic portal system.
Neurotransmitters are the chemical molecules, which help in transfer of the signals from one neuron to another. Inside the neurons, the signals are transferred as electrical signals, but at junction of two neuron, which is known as synapse, the signals are transferred in chemical forms.
These neurotransmitters have a definite shape and are recognized by the receptors present in the receptor site of the succeeding neuron. The neurotransmitters from the synapse binds to the receptor site of the receiving neuron. binding of the neurotransmitter to the receptor causes excitation of the receiving neuron, which also known as postsynaptic neuron.
Hence, Like a key in a lock, the shape of the neurotransmitter must bind with the receptors of the receiving neuron.
Biotic and living are the same thing, abiotic would be non-living
The cell wall and chlorophyll are not found in animal cells.
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-Payshence
Before your food passes from the mouth and down your esophagus, salivary amylase, an enzyme in saliva, begins to digest the starch in your bread. That is the start of chemical digestion. ... The passage of the bolus through the esophagus to the stomach occurs by peristalsis, a series of wave-like muscle contractions.
