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How does a nerve transmit impulses?

At rest a nerve cell or fiber has more sodium (NA+) ions in the extracellular fluid and more potassium (K+) ions in the intracellular fluid. There are both NA+ and K+ ion channels in the membrane of the nerv...
KW
Answered by Kay W. • Biology tutor
3582 Views

Please can we go over the process of spermatogenesis?

Of course. Spermatogenesis takes place in the seminiferous tubules of the testis. The germinal epithelium cells, which are in the wall of the seminiferous tubule, first differentiate into diploid spermatogon...
MH
Answered by Molly H. • Biology tutor
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What is a nerve synapse, and how does it transfer information?

Synapses are junctions between nerves. They allow information (impulses) to be transferred from one nerve to the next. The first nerve conducts an electrical impulse across its length, which causes it to rel...
AB
Answered by Aileen B. • Biology tutor
3388 Views

What are the important similarities and differences between RNA and DNA?

Similarities Nucleotides consist of pentose sugar, phosphate and base Differences RNA: ribose (sugar) single stranded Made in the nucleus but can move outside it U, A, G, C bases DNA: deoxyribose (sugar) Dou...
RL
Answered by Rosie L. • Biology tutor
5801 Views

What is the difference between allopatric and sympatric speciation?

Allopatric speciation occurs when populations of a species are separated by a physical barrier - this could be a river for animals that cannot swim, for example. Separation of the populations means that ther...
TM
Answered by Tom M. • Biology tutor
65755 Views