The component of an atom that possesses relatively little mass, thus being negligible in calculating the atomic mass number, is the:

A. Electron

B. Quark

C. Neutron

D. Proton

Answer Explanation:

Rationale

Electrons are subatomic particles that have relatively little mass and are negligible when calculating atomic mass. The atomic number is usually the sum of protons and neutrons in the nucleus of the atom.

Therefore, the Correct Answer is A.

Q #1: Which of the following tissues lines the interior structures of the heart?

A. Epicardium

B. Pericardium

C. Myocardium

D. Endocardium

Answer Explanation

The endocardium lines the interior structures of the heart. It is a thin, innermost layer of the heart wall that lines the heart chambers and valves. It is composed of subendocardial connective tissue and endothelial cells that are continuous with blood vessel endothelium.
Q #2: Which of the following structures drains oxygen-depleted blood from the kidneys?

A. Renal artery

B. Urethra

C. Ureter

D. Renal Vein

Answer Explanation

The renal vein drains deoxygenated blood from the kidneys to the inferior vena cava.
Q #3: Which of the following hormones regulates blood calcium levels?

A. Parathyroid hormone

B. Growth hormone

C. Norepinephrine

D. Melatonin

Answer Explanation

The parathyroid hormone (PTH) from the parathyroid glands is important in serum calcium regulation. It increases blood calcium levels by stimulating osteoclasts to break down bone and release calcium into the bloodstream. PTH also enhances the absorption of calcium from the intestines and the kidneys.

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The component of an atom that possesses relatively little mass, thus being negligible in calculating the atomic mass number, is the:

More Questions on TEAS 7 Science

Q #1: Which of the following tissues lines the interior structures of the heart?

Answer Explanation

Q #2: Which of the following structures drains oxygen-depleted blood from the kidneys?

Answer Explanation

Q #3: Which of the following hormones regulates blood calcium levels?

Answer Explanation

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