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When comparing skin coloration in people, there is a huge spectrum of very light pigment to very dark pigmented skin.  Please identify which of the following best describes the underlying physiological reason for this spectrum of pigmentation.

There are __________ of thoracic spinal nerves.

Which are found in the dermis?  Select ALL that apply:a. sweat glandsb. hair folliclesc. collagen fibersd. sensory nerve endingse. arrector pili muscles

Extra Credit What was your favorite system studied in Biol 227, and why was it your favorite? (1 pt) What was your least favorite system studied in Biol 227, and why was it your least favorite? (1 pt)

Beta 3 receptors are found on the urinary bladder, and when activated relax a muscle called the detrusor muscle.  This allows the bladder to fill with urine without contracting.  Drugs that target Beta 3 receptors of the urinary bladder are now being prescribed to treat conditions such as urinary incontinence (an inability to “hold it”) and urinary urgency (a sudden strong need to urinate).  In order to treat these conditions, which type of Beta 3 drug would be needed?

Ricardo is walking barefoot through his garage and steps on a nail with his left foot.  His left foot quickly pulls away while his right leg straightens to steady his balance.  Which statement is true of Ricardo’s situation?

What causes tropomyosin to move away from the myosin-binding site on actin?

Put these steps of excitation-contraction coupling in the proper order:

Which is an invagination of the sarcolemma?

Which is true of Na+/K+ pumps?