The first event in expiration is
A) inter-alveolar pressure increases.
B) elastic tissues of the lungs, thoracic cage, and abdominal organs recoil.
C) the diaphragm and external intercostal respiratory muscles relax.
D) air is squeezed out of the lungs.
C
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Answer the following statement(s) true (T) or false (F)
1. Breasts are present in both males and females, whereas functional mammary glands are only present in females. 2. The skin carries out the first step in the synthesis of vitamin D. 3. Living keratinocytes exfoliate from the epidermis as tiny specks called dander. 4. The deeper of the two layers of the skin is the hypodermis.
Simple macromolecules with fewer numbers of bonds yield more energy to fuel cell processes than large macromolecules.
Answer the following statement true (T) or false (F)
Skeletal muscles are stimulated to contract by release of the neurotransmitter ____________________
Fill in the blank(s) with correct word
What is the importance of the medullary ECF osmolarity gradient?
a) it allows the production of very concentrated urine b) it allows the production of very dilute urine c) it allows the reabsorption of a large quantity of salt