Answer: d. macrophages
there's nothing called natural killer cells, amino acid cells are used to build and repair muscle, enteric cells deal with the nervous system.
Answer:
In the circulatory system
Explanation:
The circulatory system of the body is where all blood cells are found.
<span>A nerve impulse is an electrical signal that travels along an axon. There is an electrical difference between the inside of the axon and its surroundings, like a tiny battery. When the nerve is activated, there is a sudden change in the voltage across the wall of the axon, caused by the movement of ions in and out of the neuron. This triggers a wave of electrical activity that passes from the cell body along the length of the axon to the synapse. Does this help you?</span>
In general terms, “sex” refers to the biological differences between males and females, such as the genitalia and genetic differences. “Gender” is more difficult to define, but it can refer to the role of a male or female in society, known as a gender role, or an individual's concept of themselves, or gender identity.
