The cardiovascular system of a newborn must be adjusted after the infant takes its first breath. Which of the following is also true?
A) The ductus arteriosus constricts and is converted to the ligamentum arteriosum.
B) The urinary system is activated at birth.
C) The foramen ovale between the atria of the fetal heart closes at the moment of birth.
D) The ductus venosus is disconnected at the severing of the umbilical cord and all visceral blood goes into the vena cava.
A
You might also like to view...
To increase blood flow to an adjacent capillary, the local controls that operate are:
increasing O2, decreasing CO2, decreasing pH decreasing O2, increasing CO2, decreasing pH decreasing O2, decreasing CO2, decreasing pH increasing O2, increasing CO2, increasing pH none of the choices are correct
The speed of contraction of skeletal muscle is related to:
A. the oxidative capacity of the skeletal muscle fiber B. the myosin ATPase activity of the skeletal muscle fiber C. the level of ?-adrenergic stimulation D. the rate of Ca++ extrusion from the skeletal muscle fiber E. the level of myosin light-chain phosphorylation within the muscle fiber
Sympathetic fibers arise only from the ________ region(s) of the spinal cord
A) cervical B) cervical, thoracic, and lumbar C) thoracic D) lumbar E) thoracic and lumbar
Which statement best describes meiosis?
A. Meiosis is a type of cell division that involves sperm and egg cells. B. Meiosis is a type of cell division that involves all cell types except sperm and egg cells. C. Meiosis is a type of cell division that involves all cell types in the human body. D. Meiosis is a type of cell division.