Discuss the structure and function of the cochlea.
What will be an ideal response?
The cochlea is made up of the vestibular duct, cochlear duct, and tympanic duct. The vestibular and tympanic ducts are continuous at the helicotrema (found at the tip of the cochlea). Their fluid, perilymph, is similar to plasma. The cochlear duct is filled with endolymph, which is similar in composition to intracellular fluid and is secreted by epithelial cells in the duct. The cochlear duct contains the organ of Corti, which sits on the basilar membrane and is partially covered by the tectorial membrane. These membranes move in response to fluid waves in the vestibular duct and bend the hair cells found in the organ of Corti. When the hair cells move, the stereocilia bend as well and cause the opening of more ion channels and depolarization.
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Which of the following statements about hormones is correct?
A. All hormones secreted by the anterior and posterior pituitary glands are peptides. B. Anterior pituitary hormones are synthesized in the hypothalamus. C. Only steroid hormones can regulate the secretion of steroid hormones. D. All of the hypophysiotropic hormones are peptides. E. IGF-1 stimulates growth by increasing growth hormone secretion through positive feedback.
Energy of motion is also called what?
A. potential energy B. kinetic energy C. strain energy D. elastic energy
What is the name of the prominence on the medial surface of the ankle?
A. Medial condyle B. Medial malleolus C. Calcaneus D. Head of the fibula E. Tibial tuberosity
At what developmental stage does the conceptus reach the uterus?
A. Zygote B. Trophoblast C. Embryo D. Morula E. Blastocyst