excitatory signals are then transmitted down the spinal cord to the sacral parasympathetic nucleus, stimulating parasympathetic activity of the sacral nerves supplying the penis. the penile smooth muscle then relaxes, and the pelvic arteries dilate. dilated arteries of the penis fill with blood, and corpora cavernosa engorges, and the penis becomes erect.

How would the previous sentence be correctly capitalized?
Answer: Excitatory signals are then transmitted down the spinal cord to the sacral parasympathetic nucleus, stimulating parasympathetic activity of the sacral nerves supplying the penis. The penile smooth muscle then relaxes, and the pelvic arteries dilate. Dilated arteries of the penis fill with blood, and corpora cavernosa engorges, and the penis becomes erect.
straight five consecutive cards of mixed suits.

How would the previous sentence be correctly capitalized?
Answer: Straight Five consecutive cards of mixed suits.
completely the same tortuous as the meanders of the lightning discharge in the air.

How would the previous sentence be correctly capitalized?
Answer: Completely the same tortuous as the meanders of the lightning discharge in the air.
not that she thought they would have, but she was worried.

How would the previous sentence be correctly capitalized?
Answer: Not that she thought they would have, but she was worried.