Answer: D) Pulmonary and aortic valves.
Explanation
There are two main heartbeats from a healthy heart.
The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.
The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.
Listening for heart beats is an essential part of cardiac auscultation.
Answer:
Through nuclear pores.
Explanation:
The nucleus of a eukaryotic cell is double membrane-enclosed organelles which enclose the genetic material of the cell.
Although the nucleus contains the nuclear membrane but the molecules are exported and imported into the cells through small pores known as the nuclear pores.
The mRNA is synthesised through the process of the transcription is exported out of the nucleus through these nuclear pores.
Thus, the nuclear pore is correct.
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I just had this answer but it hasn't been graded. I put 1. Meteor impacts, 2. volcanic gases and 5. Milankovitch cycles. I didn't put earthquakes because I wouldn't think it would affect the climate changing since they just affect ground movement.
The nurse should perform the ABC's, which starts out with A- Airway B- Breathing, and C- Circulation, if any of these are not within normal limits then the child will be given a dose of epinephrine (1/1,000) .3mg IM, Benadryl 25/50 mg followed by a dose of solumedrol