B. is a long crack, which releases lava, steam, and gases
Explanation:
A fissure is a long crack which releases lava, steam and gases into the environment. Fissures are mostly associated with volcanic bodies.
A volcano is an igneous structure by which lava erupts on the earth surface.
- most volcanoes have fissures through which they release materials into the environment.
- these features are usually permeating cracks into the deeper magmatic body.
- they often times acts as conduit for magma to reach the surface.
- in a volcanic terrain, fissures can provide good clues to the occurrence of an eruption.
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Agonists activate the receptor thereby <u>increasing</u> activity at the synapse while antagonists generally prevent agonists from activating the receptors thereby <u>decreasing</u> activity at the synapse.
- An agonist is the component that has the ability to increase the activity carried out by another substance.
- The agonists work from their faculty of coupling to a cell-type receptor, in this way, they manage to generate a certain action in the cell.
- The antagonists are the compounds that cause the opposite when they bind to the receptor, they cause a blockade by decreasing the activation of a synaptic receptor.
Therefore, we can conclude that agonists are compounds capable of increasing the action of synapse and blockers (antagonists) decrease activity at the synapse.
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The structure of digestive tract are the mouth, stomach ,small intestine, large intestine, and anus .
<h3 /><h3>What are the layers of digestive tract ?</h3>
The gastrointestinal tract is formed by four layers , mucosa ,submucosa, muscularis and serosa are the layers of digestive tract.
Mucosa is the innermost layer , is above the mucosa , muscularis is the middle layer and serosa is the outermost layer of digestive tract
The functions of digestive tract is to digest the food , absorption of ingested nutrient and to excrete the waste products from the body . Most of the nutrients are ingested in a form that is either too complex for absorption or insoluble and incapable of being digested
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Answer:
epithelial, connective, muscular, and nervous.
Explanation:
epithelial-transportation of materials, protection of underlying tissues, absorption of water and nutrients and secretion of waste products.
connective-facilitates movements between the adjacent structures, and by forming bursal sacs it minimizes friction and pressure effects.
muscular-produce force and cause motion,
nervous-transmit nerve impulses that move information around the body.
