The internal structure that permits stiffening of the penis consists of three columns of ________.
Fill in the blank(s) with the appropriate word(s).
erectile tissue
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Answer the following statements true (T) or false (F)
1. Robert Hooke named the small structures he saw “cells” because they reminded him of small monastery rooms. 2. Organelles are suspended in the interstitial fluid of the cell. 3. Ribosomes can be found attached to mitochondria or floating freely in the cytoplasm. 4. Ribosomes contain ribose sugar. 5. Mucus is an example of a Golgi apparatus product.
Which layer of the eye would be the first affected by inadequate tear production?
A) pupil B) iris C) retina D) sclera E) conjunctiva
The plasma membrane of cells lining the small intestine has ________, which are specialized for absorption of nutrients.
A. flagella B. microvilli C. cilia D. a glycocalyx E. dynein arms
Temporal summation ________.
A. only involves excitatory postsynaptic potentials B. occurs because of the convergence of many neurons on a single postsynaptic cell C. only involves inhibitory postsynaptic potentials D. occurs when a single neuron releases neurotransmitter rapidly