The secondary oocyte completes the second meiotic division when
A. the mature follicle ruptures.
B. it is penetrated by a sperm cell.
C. it receives both estrogen and progesterone.
D. ovulation occurs.
E. it is implanted in the uterus.
Answer: B
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Myoglobin is a molecule within muscle cells that can bind
A. creatine phosphate. B. oxygen. C. hemoglobin. D. acetylcholine. E. ATP.
Identify the structures innervated by the cervical plexus. Select all that apply.
a. Skin of the face
b. Skin of the neck
c. Upper limb
d. Posterior portion of the head
e. Muscles of the hyoid
f. Diaphragm
During depolarization of the plasma membrane,
A. sodium ions move rapidly into the cell. B. potassium ions move rapidly out of the cell. C. membrane permeability to sodium ions decreases. D. the outside of the cell becomes positively charged relative to the inside. E. sodium ions move rapidly out of the cell.
________ provide motility to a sperm cell, ________ act as sensory "antennae" in many cells, and ________ increase a cell's surface area
A) Flagella; cilia; microvilli B) Microvilli; flagella; cilia C) Cilia; microvilli; flagella D) Flagella; microvilli; cilia E) Microvilli; cilia; flagella