parafollicular cells - 2025 Penn Bowl

Question

These cells oppose the effects of PTH by secreting calcitonin. For 10 points each:

[10h] Name these cells that are derived from the ultimo·pharyngeal body of the fourth pharyngeal pouch in humans. Approximately 0.1 percent of the human thyroid gland is constituted by these cells.

ANSWER: parafollicular cells [or C cells; reject “follicular cells”]

[10m] In most cases, calcitonin induces a decrease in plasma calcium concentration by inhibiting the activity of these cells. Development of these macrophage-like cells is stimulated by M-CSF and RANK ligand.

ANSWER: osteoclasts [reject “osteoblasts”]

[10e] Calcitonin also opposes the effects of this vitamin that aids in calcium absorption. This vitamin can be synthesized in the skin with the help of UVB radiation.

ANSWER: vitamin D [accept vitamin D3 or cholecalciferol; accept vitamin D2 or ergocalciferol; accept calcitriol]

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Summary


2025 Penn Bowl - BU	11/01/25	Y	4	15.00	100%	25%	25%
2025 Penn Bowl - CWRU	11/01/25	Y	2	10.00	100%	0%	0%
2025 Penn Bowl - Mainsite (UPenn)	11/01/25	Y	4	17.50	100%	50%	25%
2025 Penn Bowl - Murray State	11/08/25	Y	2	10.00	100%	0%	0%
2025 Penn Bowl - Northwestern	10/25/25	Y	4	15.00	100%	25%	25%
2025 Penn Bowl - Online	11/08/25	Y	1	10.00	100%	0%	0%
2025 Penn Bowl - Ottawa	11/01/25	Y	5	10.00	100%	0%	0%
2025 Penn Bowl - Stanford	10/25/25	Y	4	12.50	100%	25%	0%
2025 Penn Bowl - UK	11/01/25	Y	7	10.00	100%	0%	0%
2025 Penn Bowl - UNC	11/01/25	Y	1	30.00	100%	100%	100%
2025 Penn Bowl - WashU	11/01/25	Y	2	20.00	100%	100%	0%

Data


I've been running into you in my lead plumbocene what could have benzene	Brandeis	0	0	10	10
Brown	MIT B	10	10	10	30
Harvard	RIT	0	0	10	10
MIT A	Yale	0	0	10	10
John Jay	JHU B	0	0	10	10
Maryland A	Maryland B	0	10	10	20
Mount Sinai	JHU A	10	10	10	30
NYU A	Maryland C	0	0	10	10
Texas B	Oklahoma	0	0	10	10
Texas A	Central Oklahoma	0	0	10	10
Pittsburgh	CWRU	0	0	10	10
Michigan B	Ohio State A	0	0	10	10
Illinois	UChicago A	10	10	10	30
Northwestern A	Purdue A	0	0	10	10
Purdue B	Northwestern B	0	0	10	10
UChicago B	UChicago C	0	0	10	10
abg academy	rusty shackleford	0	0	10	10
Carleton A	#OpenToBuzz	0	0	10	10
Toronto G	Guelph perfomative male competition	0	0	10	10
Aweille Kevin Fan osti continue comme ça	McGill B	0	0	10	10
Queen's is monitoring the situation	Toronto Operation PBSuccess	0	0	10	10
Waterloo you are crooked	Toronto Murder on the Rider Express	0	0	10	10
The best time to buzz was twenty clues ago. The second best time to buzz is now	Berkeley C	0	10	10	20
Free Win	Berkeley A	0	0	10	10
In Search of Lost Clues	Stanford A	0	0	10	10
Berkeley B	Stanford B	0	0	10	10
1. Wawa 2. Blank Street 151. Black Sheep at Kings Cross rail	Paul Quifford, or, It Was a Dark and Stormy Tournament	0	0	10	10
Bristold	Alas poor Warwick, I knew him Edinburgh	0	0	10	10
Burnaburiash's Lapis Lazuli	Chimp Brisket	0	0	10	10
Hail to the Sheaf	Coughing Baby	0	0	10	10
Washed Scrubs	Knorr Stock Clue	0	0	10	10
Of Mice and Penn	question mark	0	0	10	10
VT A	UNC A	10	10	10	30
WashU Kiki	Truman State	0	10	10	20
WashU Bouba	VJ Edgecombe School of Interior Design - Edwardsville	0	10	10	20
To buzz is to be perceived	Penn and the Art of Tossup-Bonus cycle Maintenance	0	0	10	10