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Which of the following best describes veins?

A. thick walled, small lumens, low pressure, lack valves

B. thin walled, large lumens, low pressure, have valves

C. thin walled, small lumens, high pressure, have valves

D. thick walled, large lumens, high pressure, lack valves

Answer Explanation:

Therefore, the Correct Answer is B.

Q #1: Which of the following are used to determine a person’s DNA sequence?

A. Genes

B. Enzymes

C. Hormones

D. Blood types

Answer Explanation

A gene is the basic physical and functional unit of heredity and it is the DNA that make up genes. Enzymes are biological catalysts that speed up metabolic and cellular reactions in our bodies. Hormones are responsible for controlling the action of certain cells or organs in our bodies. Blood types are of four types, A, B, AB, and O.
Q #2: Which of these organs is not considered an accessory digestive structure?

A. mouth

B. salivary glands

C. pancreas

D. liver

Answer Explanation

Accessory organs of the digestive system comprise of organs that empty secretions into the alimentary canal. These organs include salivary glands, liver, gallbladder and pancreas. The mount if path of the alimentary canal.
Q #3: Practice Question An atom has 14 protons and 20 neutrons. What is its atomic number?

A. 20

B. 17

C. 10

D. 14

Answer Explanation

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