Breathing in
When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
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I am: A) DNA
DNA is double-stranded molecule which is often also it's most known feature. Perhaps less known (depends on who you ask) are facts that it also has thymine and not uracil (uracil is found in RNA). It has four nitrogen bases and it contains deoxyribose sugar (another hint that it's DNA and not RNA).
They both are constituents of DNA.
Adenine, cytosine, guanine and thymine are the glue that holds together the two sugar-phosphate strands which form the back-bone of DNA. The order in which these bases occur is what stores the information in DNA.
1. Binary fission ("division in half") is a kind of asexual reproduction. It is the most common form of reproduction in prokaryotic such as bacteria. It occurs in some single-celled Eukaryotas like the Amoeba and the Paramecium. In binary fission DNA replication and segregation occur simultaneously. In binary fission, the fully grown parent cell splits into two halves, producing two new cells. After replicating its genetic material, the parent cell divides into two equal sized daughter cells. The genetic material is replicated, then equally split. The daughter cells are genetically identical (unless a mutation occurs during replication).
2. Bacterial binary fission is similar in some ways to the mitosis that happens in humans and other Eukaryota. In both cases, chromosomes are copied and separated, and the cell divides its cytoplasm to form two new cells. However, the mechanics and sequence of the two processes are fairly different. For one thing, no mitotic spindle forms in bacteria. Perhaps more importantly, DNA replication actually happens at the same time as DNA separation during binary fission (unlike in mitosis, where DNA is copied during S phase, long before its separation in M phase).
during exercise accomplished there is increased muscle perfusion
Arterioles dilate during exercise in reaction to adrenaline and norepinephrine released by the adrenal medulla and sympathetic nerves. Precapillary sphincters, which are not innervated, dilate in response to lactic acid, CO2, and adenosine.
During vigorous activity, blood flow through the muscles can rise more than 20-fold, requiring blood to be diverted from other organs such as the digestive tract and kidneys to satisfy the needs of the working muscles. Muscular contraction constricts blood vessels and obstructs flow.
Muscle perfusion was measured as an index of blood volume at rest using a diffusion-weighted MRI methodology and analysis approach developed in our lab.
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