What type of T cells are important for nonspecific defense and specific immunity by recognizing foreign pathogens and activating the cells to fight them?
A. T Regulatory cells
B. T Memory cells
C. T Helper cells
D. T Cytotoxic cells
Answer: C
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Answer the following statements true (T) or false (F)
1. About one third of the heart lies to the left of the midline of the sternum. 2. The blunt point of the heart is called the apex of the heart. 3. The septum, which divides the upper chambers of the heart into right and left sides, is called the interventricular septum. 4. The parietal pericardium is also called the epicardium. 5. One of the functions of the pericardium is to reduce the friction created by the beating heart.
Near the end of the first trimester, deoxygenated blood flows from the developing embryo or fetus to the placenta through
A) paired umbilical veins. B) the superior vena cava. C) one umbilical vein. D) three umbilical arteries. E) paired umbilical arteries.
The ventral spinocerebellar pathway in the spinal cord involves ascending tracts, while the ventral corticospinal pathway involves descending tracts
Indicate whether the statement is true or false
When environmental factors influence gene expression, this is referred to as:
A) polygenic inheritance. B) codominance. C) multifactorial inheritance. D) multiple alleles.