At what point do the sodium gates begin to close, shutting out further entry of sodium into the cell??

Shana is a competitive athlete who weighs 135 lb. she would like to plan a nutritionally adequate diet that provides enough carb

prisoha [69]

The correct answer is d.

Carbohydrates are a very important part of an athlete's diet, since they provide the necessary energy for competition and endurance, but also help in the process of muscle gain.

The amount of carbohydrates that Shana should consume depend heavily on the intensity of her exercise activities. For a moderate level of exercise, which equals to 1 hour of exercise daily, a person should consume 5-7 g/kg of body weight. For a high level of exercise (1-3 hours of daily exercise), a person should consume 6-10 g/kg.

Guessing that Shana will perform a high level of exercise and based on her weight (135 lb or 61.2 kg), Shana should consume 366 to 610 g of carbohydrates daily.

6 0

3 years ago

Speciation is the process by which new species are formed. Which of the following circumstances is most likely to lead to specia

trapecia [35]

Answer is A. A population becomes separated by environmental factors into two groups that do not reproduce with one another.

When a population of a species become geographically separated then gene flow between them stops. Over a period of time, the population may become genetically different in response to the natural selection due to different environments. Selection and genetic drift will act differently on these two separated populations. This will results into two separate species. This type of speciation is called allopatric speciation.

4 0

4 years ago

What are 4 characteristics of metals?

MissTica

Answer:

good conductors of heat, lustrous, malleable and ductile

Explanation:

Metals are solids under normal conditions except for mercury

8 0

3 years ago

How does the structure of DNA direct the formation of proteins?

zvonat [6]

Answer: During the process of transcription, the information stored in a gene's DNA is transferred to a similar molecule called RNA (ribonucleic acid) in the cell nucleus. ... A type of RNA called transfer RNA (tRNA) assembles the protein, one amino acid at a time.

8 0

3 years ago

Which statement is true about the male reproductive system?

umka21 [38]

Answer:

C. The scrotum functions to keep the testes at an optimum temperature.

Explanation:

In order to understand the correct answer, we need to review basic anatomy and physiology of male reproductive system.

Testes also known as testicles are paired organs located in the scrotum (bag of skin and smooth muscle) suspended from the body. Testes are responsible for the formation of sperms. Scrotum keeps the testicles away from the body. It provides a temperature cooler than the body temperature which is necessary for formation of sperms (Spermatogenesis). Sperms mix with other secretions from various internal genital organs (prosate, Cowper's glands, seminal vesicles) to form semen. Sperms constitute a very small proportion of semen.

Semen is deposited by the penis into vaginal tract from where the sperms travel to uterus.

Coming back to the answer choices,

A. The testes produce semen.

Testes produce sperms and semen is formed after sperms mix with other secretions of organs of male reproductive system.

B. Sperm cells are the largest component in the composition of semen.

Sperms constitute a small proportion of semen. Other components of semen include fructose, fibrinogen, coagulants, cholesterol etc.

C. The scrotum functions to keep the testes at an optimum temperature.

This is the correct answer choice as scrotum keeps testicles away from the body at a suitable temperature for spermatogenesis.

D. The penis enables sperm to be deposited directly into the uterus.

Penis deposits semen into the vaginal tract from where sperms travel to the uterus.

6 0

3 years ago