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Helper T-cells produce cytokines, which facilitate the actions of B-cells and Cytotoxic T-cell. B-cells are responsible for producing immunoglobulins or antibodies while cytotoxic cells directly attack and destroy pathogens. Helper T-cells, cytotoxic cells and B-cells are all antigen-specific immune cells. Macrophage cells are part of non-specific innate immune system which engulf and destroy bacteria and cellular debris during infection and injury.
Which of the following describes a role of hydrochloric acid (HCl) in the digestive system?
It converts pepsinogen to pepsin.
Which of the following is the final vessel through which semen must pass before being expelled from the body?
Which of the following organelles is responsible for digesting damaged cellular structures, as well as macromolecules and bacteria ingested by the cell?
Which statement regarding ball and socket joints is TRUE?
Ball and socket joints are multi-axial joints, which are highly mobile, allowing movement in multiple axes and planes.
Which of the following hormones is NOT increased in plasma during dehydration?
Movement of molecules in a substance depends on
Which of the following regions of the brain is the active link between the endocrine and nervous systems?
Cellular respiration, the process responsible for the production of cellular energy would be performed using which of the following organelles?
Which of the following is NOT a hormone-producing gland of the endocrine system?
Oxygen is exchanged between blood and tissues at which of the following areas?
Which of the following is a characteristic of the autonomic nervous system?
It regulates involuntary activity in the heart, stomach, lungs, and intestines.
In which part of the heart does oxygenated blood flow out of?
Which of the following statements BEST defines a scientific model?
A simplification or metaphor for an observed phenomenon.
The same single-replacement reaction is run in two different beakers. The beakers are labeled as Beaker A and B and are heated to 75°C and 100°C, respectively. If the reactions are run for 15 minutes each, which of the following results would you expect to observe?
Beaker B produces more product than Beaker A.
Which of the following is the location of fertilization in the female?
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