Gas exchange occurs in the alveoli of the lungs and each is made from a single layer of flat cells, Many alveoli in the lungs, so a large surface area for exchangement of C02 and O2. They are surrounded by a network of capillaries and oxygen diffuses out of them via the alveolar epithelium to the hemoglobin.
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Answer:
Number 3
Explanation:
Dominant: 20, Recessive: 20
An allele is the alternative of a gene. On his case, these beans represent the alleles for a simple Mendelian trait, where red is dominant (R) and white is recessive (r).
As states earlier there are 20 red beans (20 dominant alleles) and 20 white beans (20 recessive beans) and each beach represent an allele.
<h2>Axons </h2>
Explanation:
Axons cross from one side of the spinal cord to the other through the gray commisure
- Each arm or extension of the gray matter in the spinal cord is referred to as a horn
- Projecting towards the back of the spinal cord are the dorsal horns (or posterior horns)
- Projecting towards the front are the ventral horns (or anterior horns)
- In the thoracic and upper lumbar regions of the cord, an additional pair of side projections occur, which are called the lateral horns
- A narrow band of gray matter known as the gray commissure stretches across of the center of the spinal cord and connects the two sets of horns
- In the middle of the gray commissure is the central canal, which contains cerebral spinal fluid
The genome is the complete set of genetic material in a cell or organism
