Which of the following is the approximate threshold value for mammalian neurons?

A. +35 mV

B. -55 mV

C. 0 mV

D. -80 mV

Answer Explanation:

The approximate threshold value for mammalian neurons is -55mV.

Therefore, the Correct Answer is B.

Q #1: Hikers who found a human body at high altitude in the Italian Alps thought the man had died recently, but tests indicated he was shot with an arrow more than 5,300 years ago. Which of the following would be the best reason for prolonged preservation of the body?

A. The food that the person ate contained toxins that killed the bacteria that would have otherwise destroyed the body.

B. The ultraviolet rays at such a high altitude caused all the body's molecules to be preserved.

C. The arrow wound caused blood to flow out of the body, which led the enzymes that would break down tissue to be cleared from the body.

D. The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.

Answer Explanation

The answer lies in the environmental conditions of the Alps. The body was quickly frozen by the low temperature and covered by snow and ice, which prevented exposure to air, moisture, and microorganisms. The freezing also slowed down the chemical reactions that would normally break down the body's cells and tissues. Thus, the body was preserved in a natural mummy state until it was discovered by modern humans.
Q #2: Osteoporosis results from which of the following?

A. An increase in osteocyte activity while osteoclast activity continues at expected levels

B. A decline in osteoblast activity while osteoclast activity continues at expected levels

C. An increase in osteocyte activity while osteoblast activity continues at expected levels

D. A decline in osteoclast activity while osteoblast activity continues at expected levels

Answer Explanation

Osteoporosis is a condition that affects the bones, making them weak and brittle. It occurs when the balance between bone formation and bone resorption is disrupted. Bone formation is carried out by cells called osteoblasts, while bone resorption is done by cells called osteoclasts. Osteocytes are mature bone cells that maintain the bone matrix. Osteoporosis results from a decline in osteoblast activity while osteoclast activity continues at expected levels, leading to more bone loss than bone gain. This reduces the bone density and increases the risk of fractures.
Q #3: Testosterone is categorized as which of the following types of hormones?

A. Progestin

B. Androgen

C. Aldosterone

D. Estrogen

Answer Explanation

Testosterone is a hormone that belongs to the class of androgens, which are responsible for the development and maintenance of male characteristics. Androgens are synthesized from cholesterol and can be converted into other types of hormones, such as estrogens and progestins. Aldosterone is a different type of hormone that regulates the balance of salt and water in the body.

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Which of the following is the approximate threshold value for mammalian neurons?

More Questions on TEAS 7 Science

Q #1: Hikers who found a human body at high altitude in the Italian Alps thought the man had died recently, but tests indicated he was shot with an arrow more than 5,300 years ago. Which of the following would be the best reason for prolonged preservation of the body?

Answer Explanation

Q #2: Osteoporosis results from which of the following?

Answer Explanation

Q #3: Testosterone is categorized as which of the following types of hormones?

Answer Explanation

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