The plateau portion of the action potential in contractile cardiac muscle cells is due to:
A. an increased potassium permeability.
B. an influx of calcium ions.
C. an influx of sodium ions.
D. exit of calcium ions from the sarcoplasmic reticulum.
Ans: B. an influx of calcium ions.
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A) keto acids. B) high levels of proteins. C) an ammonium ion. D) acetyl CoA. E) B vitamins.
Which of the followings structures is not found in the foot?
a) Pollex b) Hallux c) Talus d) Longitudinal arch e) Transverse arch
Label L represents which structure(s)?
A) mucosal glands
B) mucosa
C) villi
D) mucous epithelium
E) lamina propria
How is colostrum different than breast milk?
A) It has one-third the number of immunoglobulins. B) It has one-third less fat. C) It has one-third less lactose. D) It has one-third less protein.