Answer: B voltage-gated potassium channels
Explanation:#
Tetraethylammonium is a pH- potassium channel blocker.
Therefore, it prevents the escape of potassium ions from the axoplasm, which makes it ( axoplam) positive from the rise in potassium ions concentration , since potassium ion is positive charged and intracellular ion . This initiate repolarization which returns to membrane state potential.
Since it is pH -potassium ion blocker; it does not affect the voltage-gated sodium ion channels, so action potential can occur. But after the sodium gated channels were closed,action potential drops but the concentration of potassium rises because :
1. They are naturally intracellular ions
2. They cannot leave the axoplasm because the channels has been shut. Therefore this stabilizes the membrane potential
D. It has the same starting and ending point.
Explanation:
The defining characteristic of a water cycle is that it has the same starting and ending point. The water cycle is also known as the hydrologic cycle. It shows the cyclic path through which water moves in nature.
- The water cycle is a part of the biogeochemical cycle.
- The biogeochemical cycle shows how certain elements and compounds moves between living organisms and the earth.
- All living organisms are essentially dependent of water and it is exchanged with the environment around.
- Some key components of the water cycle are precipitation, ocean, living organisms, ground water, infiltration, surface run off, evaporation etc.
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Answer:
Hearing
Listening
Explanation:
Hearing refers to the vibration of sound waves on the ear drums and the sending of messages to the central auditory system of the brain. The mechanism involve the use of Pinna also known as auricle to gather sound waves which is transferred into the tympanic membrane along the air canal.In the tympanic, sound waves vibrate following the waveform of the sound.
In the middle ear, the ossicles of the middle ear(malleus, incus, stape) assist in the transmission of the vibrations from the tympanic membrane into the inner ear (the cochlea).
The cochlea serve as a mechanical-neural transduction pathway, it helps to transmit sound information via the auditory nerve to the cochlear nucleus in the brainstem.
Listening refers to paying close attention to and making sense of those sounds perceived from the surrounding environment . It is the ability to get the right information without any misinterpretation in the communication process. It is the key to any effective communication.
Answer:
Answer to 1: a black hole is a tremendous amount of matter crammed into a very small (zero) amount of space. Answer to 2: the top of your head would feel so much more gravitational pull than the tips of your toes that you would be stretched, longer and longer Answer to 3: <em><u>A black hole is a place in space where gravity pulls so much that even light can not get out.This can happen when a star is dying.</u></em> The gravity is so strong because matter has been squeezed into a tiny space. because no light can get out, people can't see black holes Answer to 4: <u>stellar, intermediate, supermassive, and miniature. </u>Answer to 5: the asymmetry of bright and dark sections of the ring are caused by the Doppler effect as the matter is coming toward Earth (brighter) or receding (dimmer).
Explanation:
