Exam 50: Sensory and Motor Mechanisms

Which of the following sensory receptors is correctly paired with its category?

Although some sharks close their eyes just before they bite, their bites are on target. Researchers have noted that sharks often misdirect their bites at metal objects and that they can find batteries buried under sand. This evidence suggests that sharks keep track of their prey during the split second before they bite in the same way that

Which of the following are present in high densities in both smooth and skeletal muscle cells? I.cilia II.mitochondria III.nuclei IV.intercalated disks

Sensory transduction of light in the vertebrate retina is accomplished by ________.

Action potentials in the heart move from one contractile cell to the next via ________.

Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber? 1) Tropomyosin shifts and unblocks the cross-bridge binding sites. 2) Calcium is released and binds to the troponin complex. 3) Transverse tubules depolarize the sarcoplasmic reticulum. 4) The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5) An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane.

Myasthenia gravis is a form of muscle paralysis in which ________.

It can be very difficult to select an angle for sneaking up to a grasshopper to catch it because grasshoppers have ________.

A given photon of light may trigger an action potential with thousands of times more energy because the signal strength is amplified by ________.

The structure of the mammalian middle ear is adapted to convert ________.

The 11 pairs of appendages projecting from the rostral area of star-nosed moles are ________.

In the odorant cells of mammals, specific odorants are detected by binding to ________.

During an auditory transduction, ion flow varies across the ________.

Tastes and smells are distinct kinds of environmental information where ________.

The muscles of a recently deceased human can remain in a contracted state, termed rigor mortis, for several hours, due to the lack of ________.

A physiologist is studying the homeostatic control of blood pH. What type of receptor might be responsible for detecting changes in blood pH?

Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste. What is the most logical explanation?

Compared to viewing a distant object, a human viewing an object held within five centimeters of the eye requires a lens that ________.

Lateral inhibition via horizontal cells in the mammalian retina ________.

Statocysts contain cells that are ________.