BIO 2135 Study Guide - Bivalve Shell, Mollusc Shell, Apocrine
16 Apr 2014
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Document Summary
Abductor muscle - a muscle that moves any part of the body away from the central midline. Adaptive radiation - evolution of a variety of different species from a single common ancestor. Each is adapted for a particular niche, and the appearance of the descendants may vary considerably from each other and the ancestor. Adductor muscle - a muscle that moves part of the body toward the central midline. In brachiopodsand bivalves, it closes the bivalve shell. Albumen gland - the albumen gland is a compound tubular gland, the walls of the tubules being composed of large apocrine gland cells with basal nuclei. These cells contain numerous large ovoid granules, which stain a pale violet colour in haematoxylin/eosin preparations. Atrium - each of the two upper cavities of the heart from which blood is passed to the ventricles. The right atrium receives deoxygenated blood from the veins of the body; the left atrium receives oxygenated blood from the pulmonary vein.
