Answer:
The correct option is b. lower esophageal sphincter
Explanation:
The esophagus is the initial part of the digestive tract and its function is the transport of the alimentary bolus from the pharynx to the stomach, through the thorax and avoid the reflux thereof. It begins and ends in two sphincter structures, the upper esophageal sphincter and the lower esophageal sphincter, which separate it from the pharynx and stomach. The lower esophageal sphincter has two functions: relax during swallowing and prevent reflux of the gastric contents into the esophagus in the postdeglutory period. After swallowing, there is a relaxation of the lower esophageal sphincter, pressure dropping to levels similar to those of the gastric fundus, which allows the bolus to enter the stomach. This relaxation lasts a few seconds and is followed by a strong contraction that prevents backflow of food.
Answer:
If the trait for tall and trait for yellow are recessive: ttyy and ttyy
If the trait for tall is dominant and trait for yellow is recessive: TTyy and TTyy, Ttyy and TTyy
If the trait for tall is recessive and trait for yellow is dominant: ttYY and ttYY, or TtYy and TTYY
If the trait for tall is dominant and trait for yellow is dominant TTYY and TTYY, or TtYy and TTYY
Answer:
B) 0.25
Explanation:
In the given individual, the genotype is aaBbCc. This indicates that the individual has two pairs of contrasting alleles. Thus it will produce four different types of gametes, abc, aBC, aBc and abC will be formed. Out of 4 types of gametes only one gamete namely, aBC is with two beneficial alleles. Thus, the proportion of two or more beneficial alleles is 0.25 (1 out of 4).
Answer:
It reduces the diameter of an artery
Explanation:
<em>Atherosclerosis results in the deposition of plaques on the arterial wall. The plaque deposition narrows the diameter of the artery and consequently interferes with the flow of blood through the artery in the process. </em>
Hence, atherosclerosis functions by reducing the diameter of an artery due to plaque deposition.
The type of ion channels responsible for the depolarization phase of an action potential are Na+ (sodium)
channels. Sodium ions flow inward through the sodium channels and cause an
increase in the concentration of positively charged ions in the cell; this in
turn, leads to depolarization.