PNR 203 Exam 1 Latest 2023 Graded A

PNR 203 Exam 1 Latest 2023 Graded A Functions of testosterone Increases muscle mass and strength Promotes growth of long bones Increases basal metabolic rate Enhances production of RBCs Enlargement of vocal cords Affects distribution of body hair Signs of puberty in males Increase in the size of the penis and testes, growth spurt, pubic & facial hair, and deepening of voice Signs of puberty in females Breast development, menstrual cycle, growth spurt, and pubic & axillary (armpit) hair When do menstrual cycles start? 2-2 1/2 years after puberty, usually around 11-15 years of age What is the average amount of days per menstrual cycle? Every 28 days, plus or minus 5-10 days; the flow itself lasts from 2-5 days When does ovulation occur? 14 days before the onset of the next menstrual cycle When is the endometrium thinnest? At beginning of reproductive cycle When is the endometrium thickest? At the end of the reproductive cycle How does a menstrual cycle become regular? Regular cycles are established within 6 months to 2 years of the menarche What is the function of chorion? Forms the fetal side of the placenta What is the function of amnion? Forms amniotic sac and protects the embryo What is the function of yolk sac? Produces RBCs How many chromosomes are in a body cell? 46 How many chromosomes are in a reproductive cell? 23 What gender is a "X" chromosome? Female What gender is a "Y" chromosome? Male What week does the neural tube form? Week 3 What week does the heart form all 4 chambers? Week 6 What week do the lungs begin to secrete surfactant?