Lymphatic tissues that form a protective ring around the back of the nose and throat are called __________

Fill in the blank(s) with the appropriate word(s).


Ans: Tonsils

Anatomy & Physiology

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Place the following events in synaptic transmission at a cholinergic synapse in order:   A - A postsynaptic potential is produced; B - Voltage gated calcium channels open and calcium enters the cell; C - ACh is released and diffuses across the axon terminal; D - A nerve signal arrives at an axon terminal; E - Ligand gated sodium channels open and sodium enters the cell.      

A. D, B, E, A, C B. B, C, D, E, A C. D, B, C, E, A D. B, D, C, A, E

Anatomy & Physiology

Maturing spermatozoa are stored primarily in the

A) seminiferous tubules. B) straight tubules. C) lobules. D) interstitial areas. E) epididymis.

Anatomy & Physiology

Which of these substances normally cannot pass through the filtration membrane?

A) hemoglobin B) water C) sodium ions D) bicarbonate ions E) glucose

Anatomy & Physiology

A positive feedback loop occurs when the outcome of an event causes the event to continue occurring and amplifies its effects. Which of the following aspects of an action potential constitutes a positive feedback loop?

A. Opening of voltage-gated sodium channels causes voltage-gated potassium channels to open and release potassium to the extracellular environment, slowly counteracting sodium influx. B. The sodium-potassium pump exactly balances ion leaks by pumping three sodium and two potassium ions across the membrane. C. An initial flow of sodium ions into the neuron opens voltage-gated sodium channels, rapidly causing more sodium to enter. D. The threshold potential is around -55mV.

Anatomy & Physiology