Answer:
The answer to the question: Electrical impulses or action potentials (AP) cannot propagate across a synaptic cleft. Instead, neurotransmitters are used to communicate at the synapse, and re-restablish the AP in the post-synaptic cell, would be, true.
Explanation:
Essentially, although the CNS, PNS and ANS (Central Nervous System, Peripheral Nervous System and Autonomic Nervous System) are electrical systems, that use the electricity generated through action potentials, that in turn, are created by the exchange of electrically charged ions from within and without the neuronal cells, these electrical impulses do not pass the pre-synaptic, and post-synaptic cleft. Instead, once an AP has reached the terminal end of the pre-synaptic neuron, neurotransmitters are released by this one, into the cleft, which are then taken up by the receptors present in the post-synaptic neuron. Depending on the type of transmitter released, there will be an inhibitory or excitatory effect. Then, with the transmitter attached, the post-synaptic neuron will depolarize and a new AP will be generated in the post-synaptic neuron, which will carry on. Messages, thus are transmitted that way between neurons, and also, between the nervous system and the organs they influence.
Answer:
Cell membrane is a semi-permeable membrane that surrounds the cytoplasm.
Explanation:
Archea contains only 1 cell and they are prokaryotic organisms. They have a different molecular setting, thus making them different from bacteria.
Cell membrane of Archea:
- In archeal cell membrane, isoprene chains are connected to glycerol lipid monolayer,
- The cell membrane is either lipid bi layer or lipid mono layer.
- Archeal cell wall contains pseudo peptidoglycan.
Cell Membrane of Bacteria:
- In bacteria, the fatty acid chains are linked to glycerol.
- The cell membrane is a lipid bilayer.
- Bacterial wall contains peptidoglycans.
Answer:
The digestive tract runs from the mouth to the anus. It looks like a lengthy muscular tube with digestive organs connected along the way, up to 10 meters long. The large intestine and, to a lesser extent, the remainder of the digestive system contain a significant reservoir of microorganisms, such as bacteria.
