The ridge that separates the two ventricles in the mammalian heart is called the intraventricular __________
Fill in the blank with the correct word.
Answer: Septum
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An action potential on a neuron develops when
a. threshold voltage is reached on an axon b. voltage-gated Na+ channels open c. spatial or temporal summation of graded potentials occurs to a great enough degree d. the axon hillock reaches threshold voltage e. any of the above events occur
Arrange the four structures listed below into the order in which sperm pass from the testis to the urethral meatus.
1. ductus deferens 2. urethra 3. ejaculatory duct 4. epididymis
Bile
A. activates trypsin in the small intestine. B. emulsifies fats in the small intestine. C. digests proteins in the small intestine. D. activates the pancreas. E. is made by the gallbladder and stored by the liver.
Which of the following leads to an increase in the ratio of LDL cholesterol to HDL cholesterol?
A. estrogens B. cigarette smoking C. exercise D. weight reduction E. All of these increase the LDL:HDL ratio.