Mature sperm arrive at the efferent ducts in the epididymis immediately from which structure in the figure?
a) G
b) H
c) F
d) A
e) D
c
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When examining an endocrine cell from a new species of mammal under the microscope you find that it contains an abundance of rough endoplasmic reticulum, a large Golgi apparatus, and secretory granules. Which of the following is most likely to be true about these cells?
A. It secretes by endocytosis. B. Its hormone product is synthesized from cholesterol. C. It secretes a hormone with a hydrophobic structure. D. It secretes a peptide/protein hormone. E. It secretes its product by diffusion through the lipid bilayer of the plasma membrane.
Which of the following enters a target cell's nucleus and acts directly on the genes?
A. Insulin B. Antidiuretic hormone (ADH) C. Estrogen D. Glucagon E. Oxytocin (OT)
Answer the following statements true (T) or false (F)
1. In expiration, the size of the chest cavity is reduced. 2. In the lung, diffusion moves oxygen from the alveoli to the blood. 3. In the lung, hemoglobin becomes oxyhemoglobin. 4. Most of the carbon dioxide in the blood is carried as carbaminohemoglobin. 5. In order for external respiration to take place, the alveoli must have a higher oxygen concentration and a lower carbon dioxide concentration than the blood in the lung capillaries.
Answer the following statement(s) true (T) or false (F)
1. Sexual reproduction entails the union of two gonads to form a zygote. 2. The scrotum contains the testes and spermatic cords. 3. Sperm travels to the ampulla of the ductus deferens before reaching the spermatic cord. 4. At early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate enlargement of the testes. 5. Spermiogenesis is the last stage of meiosis. 6. Only germ cells undergo meiosis, which produces four haploid cells with 23 chromosomes each.