Introduction To The Endocrine System []. The endocrine system is a control system of ductless glands that secrete hormones within specific organs. Hormones act as “messengers,” and are carried by the bloodstream to different cells in the body, which interpret these messages and act on them.

Muscle – Arthropods: Arthropoda is the largest phylum of invertebrate s and comprises crustaceans, insects, arachnids (spiders and scorpions), and other classes.

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Enquiry into the evolution of ageing aims to explain why survival, reproductive success, and functioning of almost all living organisms decline at old age. Leading hypotheses suggest that a combination of limited resources, and an increasing risk of death by environmental causes determine an “optimal” level of self-maintenance, i.e. the repair

Learn about the muscles anatomy and their function. What are muscle, skeletal muscle, leg a d foot muscle, hip and groin muscle, shoulder & arm muscles

Muscle: Muscle, contractile tissue found in s, the function of which is to produce motion. Movement, the intricate cooperation of muscle and nerve fibres, is the means by which an organism interacts with its environment.

Opponent definition, a person who is on an opposing side in a game, contest, controversy, or the like; adversary. See more.

Antagonist and agonist muscles often occur in pairs, called antagonistic pairs.As one muscle contracts, the other relaxes. An example of an antagonistic pair is the biceps and triceps; to contract – the triceps relaxes while the biceps contracts to lift the arm.

What is antagonist and agonist muscle? See my list of Antagonistic muscle groups and help your workout by knowing more about Skeletal Muscles and Antagonistic pairs.

MUSCLES AND MOVEMENT . HOW MUSCLES WORK. A voluntary muscles usually works across a joint. It is attached to both the bones by strong cords called tendons.