It would be the endocrine system.
The answer is Antennae, ocelli,
and mandibles. Antennae are used by arthropods to sense their environment. Ocelli
also referred to as eye spots, detect light and
the mandibles are used to cut food or used as weapons in some arthropods. Antennae and mandibles are paired
appendages while ocelli are three in some arthropods
such as bees.
The blood flows through hepatic portal vein traveling to the liver, then makes it another artery which is posterior vena cava making it to the heart. It makes itself afterward to the pulmonary artery where it reaches the lungs, going back to the heart via the pulmonary vein. Eventually, it goes to the kidney through different parts such as the aortic arch, dorsal aorta and the renal artery.
Small swellings that are found at the terminal ends of axons.
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