Biology, 19.09.2020 01:01 kaliyab191

Where are semilunar valves to be found in a mammalian heart?

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Answer from: cretinous

at the base of the aortic and Pulmonary trunk

Explanation:

Structurally the mammalian heart is made up of blood vessels for the empty of the blood from the heart chambers -the ventricles. Due to the forceful contraction of the blood against gravity into theses vessels,there are tendency for the back flow, from the vessels back into the ventricles.

These may lead to mixing of deoxyganted with oxygenated blood.

Aorta is the largest artery in the heart.It takes oxygenated blood from the heart into the systemic circulations.To prevent the back flow of the pumped blood after the L.ventricular systole,layers of valves shut up,and stop the flow of blood back into the ventricles.. These are the semilunar vlaves at the bases of the Aorta. The sound produced by this shutting up is called the dupp sound.

Likewise deoxygenated blood flow into the pulmonary circulation en-route the lungs is transported by the Pulmonary trunks.Therefore to prevent the back flow of the deoxygenated blood back into the pulmonary trunk, thes semilunars valves are closed,after R. ventricular systole

These two valves ensures that R and L Ventricular contraction for the ejection of oxygentated and deoxygented blood occurs without backlow and therefore no mixing of the two types occurs.

Answer from: Quest

Schools are being forced to embrace computers. unlike their "digital immigrant" teachers, these students are "digital natives", born into a world where technology is an integral part of everyday life. almost every student has access to a multitude of computers, laptops and tablet devices. it would be crazy to assume an assignment would notbe written on computer in this day and age.many schools now have a 1-to-1 computer policy, and many districts and states in the united states have mandated computers or ipads across the state for every student, including los angeles, the second largest school district in the country.but the thing is, when they tried it in la, it wasn't the success they hoped for. that's because the tablets weren't used as much as they expected. rather, it appeared there was a gap between the digital native's love of technology and their use of it in the classroom.this conflicted relationship with computers is also underscored by much of the literature on education. it is also highlighted in professional development and conferences such as edutech.

Answer from: Quest

The basic repeating unit of nucleic acids are known as nucleotides. a nucleotide consists of three distinct chemical groups.

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