In the resting state of the membrane, which of the following situations exists for voltage-gated sodium ion channels?
A) The activation and inactivation gates alternate between being closed and open.
B) The inactivation gate is open and the activation gate is closed
C) The activation and inactivation gates are both closed.
D) The activation gate is open and the inactivation gate is closed.
Answer: B) The inactivation gate is open and the activation gate is closed
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Which of the following initiates the birth process?
A. CRH targets the fetal anterior pituitary to release ACTH. B. The hypothalamus signals the posterior pituitary to secrete oxytocin. C. Progesterone production levels decrease around six months, while estrogen levels keep increasing making the uterus more likely to contract. D. All of these happen to initiate the birth process.
Lymph nodes may be found individually, or clustered in specific regions of the body. Which cluster of lymph nodes receives lymph from the head and neck?
A. Abdominal lymph nodes B. Thoracic lymph nodes C. Axillary lymph nodes D. Inguinal lymph nodes E. Cervical lymph nodes
Horses should have at least _____________ acre(s) space per horse
Fill in the blank(s) with correct word
Which of the following events does NOT occur when the semilunar valves are open?
A) AV valves are closed. B) Blood enters the pulmonary artery and aorta. C) Ventricles are in diastole. D) Ventricles are in systole.