Ion
<u>Explanation:</u>
At the synaptic terminal, voltage-gated ion channels open, thereby stimulating the synaptic vesicles to release the neurotransmitters by exocytosis.
These ion channels are the signaling molecules in neurons. They are the transmembrane proteins that form ion channels. The membrane potential changes the conformation of the channel proteins that regulates their opening and closing. These channels play an important role in neurotransmitter release in presynaptic nerve endings.
For example - Ca²⁺ gated ion channel.
Snell's law is defined as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media”.
Answer:
the answer to the first one is B and the second one is c I hope I got them right
Answer:
Explanation:
Given data:
Earth mass 
distance between earth and asteroid is 
asteroid mass 
speed of asteroid = 2 km/s
potential energy is 


Kinetic energy 
Final potential energy of asteroid is



from conservation of energy principle

solving for K_f




Air resistance opposes the motion of falling objects. Dense air prefers to stay at low heights. More dense the air is, more air resistance it produces. Hence acceleration of falling objects decreases. Hope this helps!