Answer:
In immunology, an antigen is a molecule or molecular structure, such as may be present on the outside of a pathogen, that can be bound by an antigen-specific antibody or B-cell antigen receptor. The presence of antigens in the body normally triggers an immune response.
Answer:
The superior vena cava is formed by the merging of the right and left brachiocephalic veins.
Explanation:
The superior vena cava is one of the main veins of the human body, it is responsible for receiving blood from the head, neck, upper chest and upper limbs. It is formed by the union of the right and left brachiocephalic veins, they originate from the junction of the subclavian vein with the internal jugular vein to form the right and left brachiocephalic venous trunk, both trunks join or merge into a single trunk and they form the superior vena cava, which flows into the upper part of the right atrium.
Answer:
It is B: provides for the tight regulation of all physiological variables
Explanation:
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Homeostasis:
In biology, homeostasis is the state of steady internal, physical, and chemical conditions maintained by living systems. This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits.
Answer:
B. it gives off no radiation
Explanation:
Dark matter is so named because it neither absorbs nor emits light and therefore cannot be directly observed.
Answer:
C. axon terminals to the cell body and then down the dendrites to the synapse.o dendrites to the cell body D. dendrites to the cell body and then along the axon to the axon terminals and the synapse.
Explanation:
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