Answer:
b) Travel quickly, allowing rapid transmission of signals:
Explanation
nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body very rapidly.
The bee who is enthralled by the pollen gets some of it stuck to itself and travels with the plants offspring which ensures the plants reproduction. The wind blows the seeds of the dandelion to far off places to ensure the reproduction of the dandelion. The squirrel who is storing acorns for the winter will eat some of them, but other acorns are forgotten which ensures the reproduction of the acorn tree's reproduction.
The health
and safety of actors and crew relies on lightweight set pieces in theatrical
productions. Light weight materials were use so nobody will experience bumps or bruises especially on the heavy action part.
Moreover, during the production, everyone is required to be healthy in the
set for everybody have more than one job. All actors and crew must be ready
with the different pace of the scenes so their minds are set on what to do and
avoid unnecessary stress.
The answer is sugar provides food for the yeast
The correct answers are :
The diffusion of Na+ ions into the cell is facilitated by the Na+ concentration gradient across the plasma membrane.
The diffusion of K+ ions out of the cell impeded by the electrical gradient across the plasma membrane
The electrochemical gradient is larger Na+ than for K+
Reason:
The transfusion of Na+ or K+ takes place through either ion leakage or ion pumping. Generally the state of cell is steady which is represented by the resting membrane potential. To start any movement across the membrane, the membrane potential need to be modulated from the resting position
The first movement starts with the opening of channel for Na+ in the membrane. Since the concentration of Na+ outside the cell is ten times the concentration of Na+ inside the cell, the Na+ ion move into the cell driven by concentration gradient. The concentration gradient of sodium is extremely strong and sodium continues to move into the cell even when the membrane potential becomes zero. As the sodium moves into the cell depolaristaion is caused due to which the negative resting potential of membrane changes from -70 mV to +30 mV. With positive membrane potential, the voltage-gated channels gets opened and both sodium and potassium starts moving across the membrane. K+ moves across the membrane primarily due to the effect of electrical gradient. K+ also move across the membrane through due to concentration gradient but since the concentration difference across the channel is not as high as sodium, it could not open the voltage gate. Thus, Na movement is primarily driven by concentration gradient (in smaller amount by electrical gradient too), K movement is primarily driven by electrical gradient (in smaller amount by concentration gradient too) but the combined effect of both the concentration and electrical gradient is higher for Sodium.
