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4 years ago

ANSWER BELOW!

Biology

1 answer:

ch4aika [34]4 years ago

7 0

Answer:

c. contraction and relaxation of the heart

Explanation:

The image shows Cardiac Muscle fibers in a longitudinal section, cardiac muscle, called myocardium, have cross-striated muscle cells, it differs from skeletal muscle in, for example, having constant blood flow through blood vessels, usually having 1 central nuclei, being shorter and innervated by the autonomic nervous system, meaning it's involuntary, not having satellite cells, having different release of Calcium during the action potential (cardiac muscle requires extracellular Calcium to contract).

The cell of the myocardium are called myocardiocytes, are joined by intercalated disks to each other and by T-tubules to the cell membrane.

The primary function of cardiac muscle is repeated and constant contraction, coordinated by the electrical conduction system of the hearth. this contraction pumps the blood out of the heart and into the body, supplying oxygen and nutrients and collecting waste products from metabolism.

there are two circuits, PULMONARY and SYSTEMIC,

Pulmonary circulation: includes the right ventricle, which pumps blood to the lungs via the pulmonary artery, and the left atrium, which receives oxygenated blood coming through the pulmonary vein.

Systemic circulation: includes the left ventricle, which pumps oxygenated blood to the body via the Aorta artery, and the right atrium, which receives deoxygenated blood coming through the Cava vein.

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ou are given two true-breeding groups of rabbits. The first group has floppy ears and white fur. The second group has straight e

Lena [83]

Answer:

you expect to see that 75% of your F2 generation rabbits have floppy ears and 25% of your rabbits have black fur.

Explanation:

Available data:

Two true-breeding groups of rabbits.

The first group has floppy ears and white fur.

The second group has straight ears and black fur.

100% of the F1 generation has floppy ears and gray fur.

Each of these traits is determined by a single gene and undergo independent assortment.

Having this information we can infer that floppy years, expressed by F allele, might be dominant over straight ears, expressed by f allele. And that the fur color is affected by incomplete dominance, being B the allele expressing black color, b the allele expressing white color and Bb the genotype for grey color.

Incomplete dominance is a condition where neither of the alleles completely dominates over the other one. Descendents possess an intermediate phenotype between the two parental phenotypes and not the dominant one.

Cross between groups

Parental) FFbb x ffBB

F1) FfBb

Cross for the ear traits:

Parental) Ff x Ff

Gametes) F f F f

Punnet square) F f

F FF Ff

f Ff ff

F2) 75% of the progeny have floppy ears, FF and Ff

25% of the progeny have straight ears, ff

Cross for the fur color traits:

Parental) Bb x Bb

Gametes) B b B b

Punnet Square) B b

B BB Bb

b Bb bb

F2) 25% of the progeny have black fur, BB

50% of the progeny have grey fur, Bb

25% of the progeny have white fur, bb

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Answer:

a side thought

Explanation:

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Hi :) Hope this helps!

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