The following statements about all veins are true, except____
veins only carry blood low in oxygen
veins are our blood reservoirs
blood pressure is low in veins
veins have valves
there are no exceptions, all of the above are true
The Correct Answer is A
A. Veins only carry blood low in oxygen: This statement is false because pulmonary veins carry oxygenated blood from the lungs to the heart. Not all veins carry deoxygenated blood; the oxygen content depends on the circulation pathway.
B. Veins are our blood reservoirs: Veins are capacitance vessels that can hold large volumes of blood, acting as reservoirs. This property helps maintain circulatory stability and allows the body to adjust blood distribution as needed.
C. Blood pressure is low in veins: Venous pressure is significantly lower than arterial pressure because veins are farther from the pumping action of the heart and have thinner walls with less smooth muscle.
D. Veins have valves: Many veins, especially in the limbs, contain valves that prevent backflow and assist in returning blood to the heart against gravity. These valves are crucial for maintaining unidirectional flow.
E. There are no exceptions, all of the above are true: This is incorrect because statement A is false; veins do not exclusively carry deoxygenated blood.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Antigenic:“Antigenic” is not a classification of T cells. It describes a property of a substance that can trigger an immune response, not a type of T lymphocyte.
B. Cytotoxic:Cytotoxic T cells (CD8+) directly kill infected or abnormal cells. They are a major type of T cell responsible for cell-mediated immunity and defense against viruses and cancer cells.
C. Regulatory:Regulatory T cells (Tregs) modulate the immune response by suppressing excessive or inappropriate activation. They help maintain immune tolerance and prevent autoimmune reactions.
D. Helper:Helper T cells (CD4+) assist other immune cells by releasing cytokines that stimulate B cells, cytotoxic T cells, and macrophages. They are essential for orchestrating the adaptive immune response.
Correct Answer is C
Explanation
A. Increased risk of developing atherosclerosis:Excess adipose tissue is associated with dyslipidemia and inflammation, which promote the formation of arterial plaques. This increases the risk of atherosclerosis and cardiovascular disease.
B. Higher peripheral resistance and higher blood pressure:Additional adipose tissue increases the total vascular network and tissue demand, which raises peripheral resistance. This elevated resistance contributes to higher blood pressure over time.
C. Lower heart rate and reduced blood flow:A sudden gain in adipose tissue does not typically lower heart rate. In fact, increased tissue mass often requires the heart to pump more blood, which may elevate cardiac output and maintain or even increase heart rate. Reduced blood flow is not expected.
D. Increased angiogenesis and higher peripheral resistance:The body responds to expanding adipose tissue by forming new blood vessels (angiogenesis) to supply the tissue with nutrients. This can also increase peripheral resistance due to the larger vascular network.
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