A scrotal muscle that contracts in response to cold environmental temperature is the cremaster
Indicate whether the statement is true or false
TRUE
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In which area of the eye does the sharpest, most detailed, daytime vision occur?
A. Optic disc B. Ora serrata C. Macula lutea D. Fovea E. Periphery of the retina
For most cells, the membrane potential is closer to the Ek+ (-90 mV) than for ENa+ (+ 60 mV). This is because
a. EK+ <<<< ENa+, and systems tend toward lower energy states. b. cells like potassium better than sodium, so they work to maintain potassium closer to its equilibrium distribution. c. cell membranes are equally permeable to Na+ and Cl-, so every time a Na+ comes in, its depolarizing effect is negated by a Cl- ion. d. cell membranes are more permeable to K+ than Na+, so there are a greater number of pathways available for K+ to move towards its equilibrium distribution than are available for Na+ to do the same. e. none of these.
The integumentary system ________
A) is a site for blood-cell formation B) breaks down ingested food C) protects the deep organs from injury and drying out D) contributes to the acid-base balance of the blood
Earthworms organize locomotor striated muscles into __________ and __________ layers
Fill in the blank with correct words.