PNB 2XC3 Chapter Notes - Chapter 3: Ejaculation, Thyroid-Stimulating Hormone, Mushroom Bodies
16 Dec 2017
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Ultimate: centering on forces that have shaped a trait over evolutionary time. In proximate analysis, we are working with factors that operate within the lifetime of an organism. Proximate question: why do males but not females actively search for food: males receive significant benefits for having colourful plumage, females do not, males are much likely to get a mate, females are attracted to colourful plumage. Communication network that influences many aspects of animal behaviour. Composed of a group of ductless glands that secrete hormones directly into the bloodstream. Adrenal gland, pituitary gland, thyroid gland, pancreas, the gonads and the hypothalamus. Within these glands are endocrine cells- synthesize and then secrete hormones. Exp: neurohormones can be released into the blood via neurons. Hormones are chemical messengers, affecting target cells that reside some distance from the gland secreting the hormone. Peptide hormones- made up of only a small number of amino acids.
