Sperm enter the cervical canal through the external
A) isthmus.
B) ampulla.
C) fimbra.
D) os.
E) commissure.
D
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The calorigenic effect of thyroid hormones refers to their effect in increasing the rate at which the body synthesizes protein and fat.
Answer the following statement true (T) or false (F)
Smooth muscle has ___________ and not troponin
A) calmodulin B) norepinephrine C) fibronectin D) titin
Peptide hormones are:
A. synthesized by the ribosomes of endocrine cells. B. synthesized in the nucleus of endocrine cells. C. synthesized out of the amino acid tryptophan. D. the least prevalent type of hormone in the body. E. manufactured cooperatively by the mitochondria and smooth endoplasmic reticulum.
What brain center has neurons that fire mainly during inspiration and have input to the spinal motor neurons that activate the diaphragm and inspiratory intercostal muscles?
A. the ventral respiratory group of the medulla oblongata B. the pre-Bötzinger complex C. the dorsal respiratory group of the medulla oblongata D. the pneumotaxic center of the pons E. the apneustic center of the pons