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As plants don't have a circulatory system, plant hormones diffuse from cell to cell to reach their target.

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Hormones a cell will secrete to activate sensors on its own surface.

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Diffuse into the surrounding environment where they're secreted and act on nearby organs

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Hormones that move through the blood and can target organs rapidly

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Autoimmune diseases occur when cells of the immune system incorrectly identify host markers as non-self. They fail to recognise self markers on self cells

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The body cannot generate appropriate immune responses against invading microorganisms/pathogens

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A very serious allergic reaction is called anaphylaxis. Anaphylaxis leads to life threatening immune responses such as:
- swelling of the throat
- dropping of blood pressure

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Allergies usually result in:
- itchiness
- rashes
- sneezing
- inflaminiation

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IgE primes mast cells are what is responsible for this reaction. IgE antibodies were originally targeted at parasites.

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Examples of common harmless antigens are:
- pollen
- dust
- peanuts
Examples of uncommon harmless antigens are:
-  water
- coins
- semen

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Hormones are a type of signaling molecule found in both plants and humans. In humans, they use the circulatory system to diffuse through the body and reach tissue to find the target cell, which will have a specific receptor. Can be either lipid or protein based and their uptake by the target cell will change depending on that function. They are significantly slower eliciting a response, as the time taken to diffuse to a target cell is long but they can have a much more prolonged response.

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Destroy infected self cells
Binds to the MHCI marker

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Activate other parts of the immune system
Binds to the MHCII marker

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Also known has hypersensitivities. Allergies is when immune cells of the body react inappropriatly to a harmless antigen

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Mature in the thymus

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phagocytes aer

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An agent that causes disease

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Mature in the bone marrow
Produce antibodies
Also memory B cells do that thing
I don't know how else to put it
Someone help me

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Specific
B-cells, T-cells
Lymphatic system

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non-specific resistance against pathogens. This happens in a generalised way without specifically targeting specific individuals?/pathogenic cells

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Hormones, neurotransmitters, cytokines, pheromones

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Non-specific
Physical and chemical barriers to prevent a pathogen from entering the body

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I guess

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Travel between synapses. An electrical signal is sent down the axon of a neuron which stimulates exocytosis of the neurotransmitters at the synapse. The vesicle containing the neurotransmitter is exocytosed across the synaptic gap, to the post synaptic membrane where they meet complimentary receptors, as they're proteins. The process releases secondary messenger molecules and activate action potential down the next neuron. Neurotransmitters are quite specific about a target and very very quick.