Which plexus gives rise to nerves that supply the hamstring muscles?
A. Gluteal plexus
B. Sacral plexus
C. Cervical plexus
D. Lumbar plexus
E. Brachial plexus
B. Sacral plexus
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A young man who ran 6 miles a day throughout high school is injured during his first
season running cross country in college, and must rest for three months, then gradually begin exercising again. The skeletal muscles in his lower limbs decrease in size during this prolonged period of inactivity. The organelles that break down his muscle protein are A) ribosomes. B) lysosomes. C) centrosomes. D) peroxisomes.
The ________ provide(s) an effective physical barrier to invasive microbes, while ________ provide(s) an effective chemical barrier.
A. lysosomes; ciliated cells B. mucous membranes; stomach acid C. perspiration on the skin; sebum from glands D. normal flora; skin
In vertebrates, the CNS is protected by bony cases, the brain inside the ________, while the spinal cord runs through a canal inside the ________.
Fill in the blank(s) with the appropriate word(s).
What occurs during the period of interphase known as the S phase?
A) DNA replication (synthesis) takes place. B) Genetic material is divided between the daughter cells. C) The cell is rapidly synthesizing proteins. D) Proteins, organelles, and cytosol are divided between the daughter cells.