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Mariana [72]
3 years ago
10

Where are barbules and pinnae connected to the feathers of birds?

Biology
1 answer:
Firdavs [7]3 years ago
3 0
What is barbules and pinnae?
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What does an adult lack if they get chicken pox
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What's the main characteristic of porosity?
aev [14]

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The answer should be D

Explanation:

because poroslty of a rock is a measure of its ability to hold a fluid. mathematically, it is the open space in rock divided by the total rock volume.

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What three structures, in order, are involved of the production of mature sperm?
34kurt

Answer:

The three anatomical structures that, in order, contribute to the production of mature sperm are the epididymis, seminal vesicle and prostate.

Explanation:

The sperm and the first seminal fluid are produced and found initially in the seminiferous tubules of each testicle. From there they move on to several structures that contribute to the maturation process:

  1. Each <u>seminiferous tubule </u>drives the sperm to the epididymis, through the vas deferens, where the sperm can be for a long time and complete their maturation process.
  2. From the epididymis, the sperm pass to the seminal vesicle, which produces more seminal fluid to give nutrients to the sperm and facilitate its movement.
  3. Finally, and before being expelled outside, the seminal fluid receives the prostatic secretion in the prostatic urethra, a viscous and whitish liquid that completes the seminal fluid content.

The process of maturation of sperm is of  importance for the process of sexual reproduction.

Learn more:

brainly.com/question/1173367

6 0
3 years ago
Steroid hormones and thyroid hormones ________ pass across the plasma membrane; they cause the target cells to ________ that pro
tekilochka [14]

Answer:

can ,synthesize specific proteins

Explanation:

Hormones are chemical signals secreted by animals and plant that are capable of regulating body activities and maintain homeostasis.

They are transported in the circulatory system of the body

The action of hormones can be seen after the hormone has bound to its specific receptor found inside the cell.

For instance, steroid hormone and the thyroid hormones can pass through the plasma membrane to their receptors inside the cells.

When they bind with their receptors, the target cells will synthesize specific proteins that produce the characteristic effect of the hormone.

6 0
3 years ago
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