How does the breeding soundness evaluation of a stallion differ from that of a bull?
What will be an ideal response?
A stallion is allowed to mount either a dummy or live mare and ejaculate into an artificial vagina. The entire ejaculate is collected, measured, and examined in order to determine fertility. A bull, on the other hand, is most often confined to a squeeze chute and ejaculated through the use of an electrically charged probe. Only a small portion of the ejaculate is collected and examined.
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A vertebrate motor unit is
a. a muscle and the motor neurons that innervate it. b. a muscle fiber and the motor neurons that innervate it. c. a motor neuron and the muscle fibers it innervates. d. a motor neuron and the muscle it innervates. e. none of these.
Which cells form myelin in the spinal cord?
A. Oligodendrocytes B. Satellite cells C. Microglia D. Schwann cells E. Astrocytes
What flap of elastic cartilage keeps food and liquids from entering the larynx during swallowing?
A) corniculate cartilage B) arytenoid cartilage C) epiglottis D) thyroid cartilage
The allantois enlarges to form the
A. kidney. B. gonads. C. ureter. D. urinary bladder. E. urethra.