Answer:
Renin; angiotensin I and angiotensin II
Explanation:
Renin is a key hormone involved in the renin-angiotensin-aldosterone system (RAAS), which is responsible for regulating blood pressure in response to changes in blood volume. Renin is secreted primarily by the kidneys to promote the production of the peptide hormone angiotensin in the blood vessels. Subsequently, angiotensin stimulates the release of aldosterone from the adrenal cortex, stimulating sodium retention by the kidneys. Renin acts on its substrate angiotensinogen to yield angiotensin I, which is then converted to angiotensin II by the angiotensin-converting enzyme (ACE). Finally, angiotensin 2 promotes the release of aldosterone by the adrenal cortex, which acts on renal tubules, leading to the reabsorption of sodium and water and the excretion of potassium.
Climate change, habitat destruction, extinctions — thousands of years ago. And humans may have been partly to blame for many of those changes in nature, too. with a changing climate, led to the extinction of many species of megafauna about 12,000 years ago in the southern portion of what is now South America.
The frequency of the wave is 0.196 Hz
<h3>Speed of a wave</h3>
The speed of a wave is given by v = fλ where
- f = frequency and
- λ = wavelength
<h3>Frequency of the wave</h3>
Making f subject of the formula, we have
f = v/λ
Since
- v = speed of wave = 4.5 km/s = 4.5 × 10³ m/s and
- λ = wavelength = 2.3 × 10⁴ m.
Substituting the values pof the variables into the equation, we have
f = v/λ
f = 4.5 × 10³ m/s ÷ 2.3 × 10⁴ m.
f = 1.957 × 10⁻¹ Hz
f = 0.1957 Hz
f ≅ 0.196 Hz
So, the frequency of the wave is 0.196 Hz
Learn more about frequency of a wave here:
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We mean that..... only some substances are allowed to enter the cell.
The membrane is responsible for the permeability of substances. Not all substances are permitted.
Passive transport must occur to maintain homeostasis. Active transport must occur to get the needed nutrients in and out of the cell.
