Answer:
The capillary membranes that filter substances moving between the cerebral blood vessels and the brain are called the blood-brain barrier.
Explanation:
Capillaries are the smallest type of blood vessel in the body. Capillaries enable the exchange of substances between the blood and surrounding tissues. They are thinner than arteries and veins, because their walls are made up of only a single layer of endothelial cells, the flat cells that line all blood vessels. Capillaries function to deliver nutrients and oxygen to tissues and remove the byproducts of cellular reactions, such as water and carbon dioxide.
The Blood-brain barrier is an anatomic and biochemical barrier that protects the brain from potentially harmful substances. It is a highly selective membrane barrier at the brain microvessel level which aids transport between the systemic circulation and the central nervous system.
The Blood–brain barrier restricts the passage of pathogens, aids in ensuring solutes are diffused in the blood, and hydrophilic or large molecules into the cerebrospinal fluid, while allowing the diffusion of hydrophobic molecules (oxygen, carbondioxide, hormones) and small polar molecules.
The phenotype ratio would be 25% each for widow's peak and freckles, widow's peak without freckles, straight hairline with freckles, and straight hairline without freckles.
<h3>Dihybrid crossing</h3>
Genotype of the heterozygous parent: HhFf
Genotype of the other parent = hhff
Crossing the two parents:
HhFf = 1/4 = Widow's peak, freckles
Hhff = 1/4 = Widow's peak, no freckles
hhFf = 1/4 = straight hairline, freckles
hhff = 1/4 = straight hairline, no freckles.
More on dihybrid crossing can be found here:brainly.com/question/1185199
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Answer:
It is (x+y)t miles from the school to Bob's home
Explanation:
Assuming the distance from Bob's home to school is d miles and the time taken is t hours
Distance covered when he had flat tire = d/2, time taken = t/2, rate = x miles/hour
Rate = d/t
x = (d/2)/(t/2)
d = xt miles from Bob's home to halfway the school
distance from halfway the school to the school = d/2, time taken = t/2, rate = y miles/hour
rate = d/t
y = (d/2)/(t/2)
d = yt miles
Total distance from school to Bob's home = xt + yt = (x + y)t miles
Lay her on the scale that would work