1. REPRODUCTIVE BEHAVIOR Chapter 11

3. Mammary Ducts

4. Female Behavior Attractivity - postures, vocalization, other behaviors, pheromones Proceptivity - head butting, mounting of male, female-female mounting Receptivity - immobility, lordosis, tail deviation, backing up toward the male

9. Erection of the Penis Elevation of arterial blood inflow Dilation of corporal sinusoids - erotogenic stimuli – release nitric oxide – convert guanylate triphosphate to cyclic guanosine monophosphate, Phosphodiesterase 5 converts cGMP to GMP – increased vascular tone – loss of erection, Sildenafil blocks PDE 5 Restricted venus outflow Elevated intrapenile pressure Relaxation of retractor penis muscle

12. Postcopulatory Behavior Refractory period – length of time before a second ejaculation can occur – Influenced by: sexual rest, age, species, female novelty, number of previous ejaculations Satiation – further stimuli will not cause immediate responsiveness Exhaustion – no further sexual behavior can be induced