The visible spectrum for humans extends between a wavelength of
A) 700 and 1000 nm.
B) 100 and 200 nm.
C) 200 and 400 nm.
D) 2000 and 2500 nm.
E) 400 and 700 nm.
E
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The trigone is
A) a muscle layer that surrounds each kidney. B) a region where the glomerulus meets the glomerular capsule. C) a triangular area on the floor of the urinary bladder. D) a group of three neighboring nephrons in a kidney.
What is NOT true of conduction through dendrites and cell bodies of neurons?
A. It creates EPSPs. B. EPSPs can summate to reach threshold. C. It generates action potentials in the cell body. D. It is spread by cable properties.
Define a nerve plexus trunk and cord
A) A nerve plexus trunk is a large bundle of axons from several spinal nerves; a nerve plexus cord is a smaller branch of nerves that originates at a trunk. B) A nerve plexus trunk is a small bundle of axons from several spinal nerves; a nerve plexus cord is a larger branch of nerves that originates at a trunk. C) A nerve plexus trunk consists of the posterior rami of each spinal nerve; a nerve plexus cord is a division of each trunk. D) A nerve plexus trunk is a small division of a nerve plexus cord; a nerve plexus cord is a larger branch from the posterior rami of spinal nerves. E) A nerve plexus trunk consists of the posterior rami of spinal nerves; a nerve plexus cord consists of the anterior rami of spinal nerves.
Out of the 300 million ejaculated sperm, only about ________ reach the vicinity of the egg
A) 20 to 30 B) 200 to 300 C) 2000 to 3000 D) 20,000 to 30,000 E) half