The immune system has many kinds of white blood cells to fight infections. HIV finds the white blood cells, called CD4 cells. But with cancer the white blood cells are being killed off.
During a facial trauma due to facial injuries is generally sustained by maxillary bone. Maxilla is a combination of two bones and forms the upper jawbones. It supports the upper teeth while the mandible supports the lower teeth. Direct facial injury may cause maxillary injuries. The zygomatic bone protects the cheekbone and lies between orbital bone and maxilla.
The facial skeleton protects the facial bones and house the sense organs. The facial bone is complex MAXILLA house the upper teeth in the facial bone. It is thickened in an inferior concavity.
Answer;
-Presynaptic neuron
Explanation;
-When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the presynaptic neuron.
-This is a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.
- A postsynaptic neuron is a neuron to the cell body or dendrite of which an electrical impulse is transmitted across a synaptic cleft by the release of a neurotransmitter from the axon terminal of a presynaptic neuron.
Answer:
smooth endoplasmic reticulum
Explanation:
Smooth endoplasmic reticulum differs from the rough endoplasmic reticulum in not having ribosomes on its surface. The smooth endoplasmic reticulum (SER) extends from the rough ER and forms a network of membrane tubules. The function of the smooth ER is to serve as a site for the synthesis of lipids, fatty acids, and steroids such as estrogens and testosterone.
Enzymes for the synthesis of these diverse biomolecules are present in smooth ER. The smooth ER present in the muscle cells is called the sarcoplasmic reticulum. It stores the calcium ions which are released into the sarcoplasm of muscle cells during muscle contraction.
