It is inherited in an autosomal recessive manner and is caused by a mutation in the HBB gene. The mutation that causes hemoglobin E disease primarily occurs in Southeast Asian populations, and rarely in Chinese populations. Most people with HbE disease do not need any treatment.
CHAPTER 27 Homework Review ï· The ability of sperm cells to move along the ductus deferens is due to ________. peristaltic contractions ï· Prostate cancer is _______.sometimes a slow-growing cancer that may never represent a threat to the patient ï· Erection of the penis results from ________.a parasympathetic reflex ï· Why doesn't semen enter the ...
Vas deference. The ductus deferens, or the vas deferens, is a male anatomical part; there are two of these ducts and their purpose is to carry ejaculatory sperm out of the epididymis.ach ductus deferens is supplied by the artery of vas deferens, which branches out of the superior vesicle artery. Each ductus deferens is a tube that is approximately 30 centimeters in length and protected by smooth muscle mass. This muscle mass contracts reflexively during ejaculation in a process called peristalsis.