Answer:
movement of chemicals into the dendrites of the neuron
Explanation:
Nerve impulse occurs when electrical gradient is moved across the plasma membrane of a resting neuron this is done when the neuron receives a chemical signal from another cell or some other type of stimulus. This action potential then travels down the neuron’s axon as an electric current.
Resting potential occurs because of the difference in electrical charge across the plasma membrane of a neuron.
An electrical gradient is maintained by the sodium-potassium pump this is done across the plasma membrane of a neuron when it is not transmitting a nerve impulse this is the resting potential of the neuron.
Answer:
In a primary immune response, naive B cells are stimulated by antigen, become activated, and differentiate into antibody-secreting cells that produce antibodies specific for the eliciting antigen.
A secondary immune response is elicited when the same antigen stimulates memory B cells, leading to the production of greater quantities of specific antibodies that are produced in the primary response
Answer:
Explanation:
The epididymis is a long, coiled tube that rests on the backside of each testicle. It transports and stores sperm cells that are produced in the testes.It will then release sperm when sexual intercourse takes place
Answer:
Explanation: One of the potential consequences of groundwater overdraft is water-quality degradation. The USGS has characterized many linkages between water use and water quality and found that the processes affecting water quality vary widely and depend on a complex suite of factors. These factors can include natural geology and local aquifer conditions, human activities related to land use, and well construction and operation. Determining changes in groundwater quality over time involves systematic monitoring of constituents of concern, coupled with an understanding of the dynamics of a groundwater-flow system.
Groundwater quality can be assessed using both existing wells installed for water supply and wells installed specifically for monitoring. Groundwater monitoring-well networks and related data are developed based on the characteristics and needs of each groundwater basin.
Photo of a USGS hydrologist preparing equipment during groundwater sampling in Jurupa Valley, California.
A USGS hydrologist prepares equipment during groundwater sampling in Jurupa Valley, Calif. Photo: USGS.
Water-quality data for principal aquifers may be available based on information from existing technical studies or regulatory programs. The USGS has a wide body information, data, and tools to support water-quality assessments statewide. Combining USGS data with other quality-assured data can assist water managers and GSAs with basin-wide assessments and water quality mapping. Links to data are indicted at the conclusion of each section, for the example studies described below.