Answer:
This question lacks options, the options are:
a. Presynaptic; Ca2+ ions
b. Postsynaptic; Ca2+ ions.
c. postsynaptic; neurotransmitters
d. presynaptic; neurotransmitters
e. dendritic; neurotransmitters
The correct answer is d. Tetrahydrocannabinol, the active ingredient in marijuana, binds to receptors located in the <u>presynaptic</u> terminals of certain brain neurons. It lowers the likelihood that these neurons will release <u>neurotransmitters</u>
.
Explanation:
Tetrahydrocannabinol is the most abundant cannabinoid in most cannabis varieties and has the most potent psychoactive effect. Conventional neurotransmitters are water-soluble substances stored in small vesicles at the thin ends of the axon (presynaptic terminals). When a neuron generates an impulse by sending an electrical signal along the axon to the presynaptic terminals, the neurotransmitters are released from the vesicles, diffuse through a narrow intercellular space (synaptic cleft) and interact with the receptors on the surface of the recipient neuron (postsynaptic neuron). Cannabinoids cause a decrease in the release of neurotransmitters from the presynaptic terminal through the inhibition of Ca++ channels. This signaling is mediated by the βγ subunit of the G protein. The βγ subunit of the G protein inhibits the Ca channels of type N and P / Q, which are the majority in presynaptic neurons.
Answer:
Energy enters the ecosystem via sunlight as solar energy
Explanation:
when the solor energy comes down it goes to the grass when the animals eat it they have consumed that i put a picture below if that helps
Answer:
B. Competition for light and moisture
Explanation:
Plants grow towards sunlight which is necessary for photosynthesis, of which they utilize sunlight, carbondioxide, and moisture to manufacture their food. In the tropical rain forest, competition is intense among plants for sunlight and moisture.
The trees/plants that are able to get enough sunlight and moisture gain advantage over others as they grow bigger and taller, as the rest struggle to get some sunlight and moisture. The canopy of taller trees usually cut-off sunlight from teaching shorter trees, thereby making availability of sunlight to the shorter trees quite limited. As a result of this, we have variations of trees with different height in the tropical rainforest.
