Playing catch with your young son, you blithely mention, “Wow, you must have excellent Ruffini endings.” He replies, “No, Mommy! My Ruffinis are beginnings!” Both of you laugh, but you explain that Ruffini endings are very helpful to humans catching balls. How do they help?

a. They detect impact stress, like when a ball hits a hand or glove.
b. They detect pain when a ball hits the hand hard enough to hurt.
c. They detect skin stretch and deformation in joints, allowing for object gripping.
d. They detect deep pressure such as one feels when gripping a ball hard preparing to throw.


c. They detect skin stretch and deformation in joints, allowing for object gripping.

Biology & Microbiology

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Match the reactant in glycolysis on the left with the appropriate enzyme on the right.

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Biology & Microbiology

The rapid expansion of angiosperms late in the

Mesozoic era appears to be related to their coevolution with a. dinosaurs. b. gymnosperms. c. insects. d. mammals. e. birds.

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During __________ between predator and prey species, the predatory species becomes more efficient

at catching prey, while the prey species becomes better at escaping predators. a. character displacement b. coevolution c. Batesian mimicry d. competitive exclusion e. succession

Biology & Microbiology

In order to understand the carbon cycle, it is important to recognize where carbon can be found on earth. Carbon can be found in

What will be an ideal response?

Biology & Microbiology